CN101184065B - Method and equipment for implementing voice communication between IPv6 and IPv4 network terminal - Google Patents
Method and equipment for implementing voice communication between IPv6 and IPv4 network terminal Download PDFInfo
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Abstract
The invention discloses a voice communication realizing method and the device between IPv6 and IPv4 network terminals, comprising the following steps: conversation establishment, communication, and communication ending. The method of conversation establishment is as follow: when a SIP voice terminal in IPv6 network initiates a conversation to the SIP voice terminal in IPv4 network, an end-to-end address set up with the conversation is provided in the form of ''the interface address of the network gateway of the name of user@IPv6 in IPv4 network''; when the SIP voice terminal initiates a conversation to the SIP voice terminal in IPv6 network, different user names are used to distinguish the terminals in IPv6 network, the terminal user names in IPv6 network and the IPv6 addresses are transformed via the gateway. The invention has the advantages that based on the SIP protocol, the IPv6 network and the IPv4 network terminal carry out voice communication simultaneously in the condition of using only one IPv4 address.
Description
Technical field
The present invention relates to network communication field, relate in particular to the method and apparatus of a kind of IPv6 of realization and the speech communication of the IPv4 network terminal.
Background technology
Compare with the IPv4 agreement, IPv6 possesses a series of advanced features, as the address space of abundance, configuration, improved mobility and fail safe automatically.Along with the quickening of IPv6 network design paces, interference networks in the future will certainly be structured on the IPv6 gradually.But the deployment of IPv6 network is a progressive process, and we can not look to all overnight networks all to become network based on IPv6.Therefore at the deployment initial stage, it must be a period that coexists with IPv4.So, such a case is just appearred in network possibly that dispose based on IPv6, as shown in Figure 1: the IPv6 network of deployment only is an IPv6 network islands one by one, it by a gateway device with the two stacks of IPv6/v4 come with external IP v4 network in the IPv4 node carry out communication, or stride across the IPv4 network by modes such as tunnel protocols and come to carry out communication with other IPv6 network.
For SIP (SIP) voice terminal commonly used in the IPv6 network, how to carry out speech communication with VoIP (IP speech) voice terminal that just is being widely used at present the IPv4 network, just become a considerable problem.NAT-PT (network address translation-protocol conversion) is a kind of IPv6 commonly used and the method for IPv4 mutual communication.But owing to following three reasons, this method is for the problem that proposes above and inapplicable, and its reason is as follows:
(1) SIP is in order to set up the application layer protocol of media session.When running into this quasi-protocol of NAT-PT, will run into some troubles, because in the payload of SIP bag, comprising the address that is used to set up session.NAT-PT is irrelevant with application, and it only can shine upon the address in the IP packet header, and can not survey the address in the payload of SIP bag.
(2) basic thought of NAT-PT is for needs carry out IPv6 and IPv4 nodes in communication, dynamic or static sets up a kind of relation of mapping one by one.When future, the IPv6 network carried out actual deployment, distributable IPv4 address is inevitable to be that there is a serious shortage in the supply, and the miscellaneous equipment (as PC PC) that often has several SIP voice terminals in the IPv6 network islands and can converse based on SIP.Therefore we can not respectively distribute an IPv4 address for all these kind equipments in the IPv6 network when carrying out voice call with extraneous IPv4 opposite end.Therefore the solution of NAT-PT+SIP-ALG (SIP-ALG) is also also herein inapplicable.The method of reality is to need all this class IPv6 equipment when conversing with extraneous IPv4 opposite end, all uses same IPv4 address.
(3), as if can solve this problem with NAPT-PT (NAT-PT of band edge slogan) based on (2) point.But answer is negated.In the method that realizes with NAPT-PT+SIP-ALG or with NAT-PT+SIP-ALG conversing between the SIP voice terminal in IPv6 and the IPv4 network, in the To header field of INVITE,, IPv6 and the difference of IPv4 on the address have been shielded with domain name with the mode of " user@ domain name ".But for the IPv6 network design initial stage, the IPv6 network islands that does not have domain name is inapplicable.The SIP voice terminal of only supporting IPv4 like this in the IPv4 network is to shield the IPv6 address with the mode of domain name, and it is directly to make a call with the mode of " user@IPv6 address ".Therefore realize that with NAPT-PT+SIP-ALG or with NAT-PT+SIP-ALG the method for conversing between the SIP voice terminal in IPv6 and the IPv4 network is not suitable for herein yet.
Summary of the invention
The technical problem to be solved in the present invention provides the method and apparatus of a kind of IPv6 of realization and the speech communication of the IPv4 network terminal, the network terminal in the realization IPv6 network in a plurality of network terminals and other IPv4 network, based on Session Initiation Protocol, under the situation of only using an IPv4 address, carry out speech communication simultaneously; And be applicable to IPv6 network with domain name.
In order to address the above problem, the invention provides the method for setting up session between a kind of IPv6 of realization and the IPv4 network terminal, comprising:
During the SIP voice terminal initiation session of the SIP SIP voice terminal in the IPv6 network in the IPv4 network: with the IPv6 address that called party address was mapped out is the sip message that target sends initiation session; By gateway with the SIP voice terminal address in the IPv6 network in this message change the interface IP address of IPv6 gateway in IPv4 net into, the recipient is issued after being reduced to the IPv4 address by the IPv6 address that maps out in SIP voice terminal address in the IPv4 network;
During the SIP voice terminal initiation session of the SIP voice terminal in the IPv4 network in the IPv6 network: user name and the interface IP address of IPv6 gateway in the IPv4 net with the callee are the sip message that target sends initiation session; Issue the recipient after changing the IPv4 address of the SIP voice terminal in the IPv4 network in this message into its IPv6 address that is mapped to, SIP voice terminal address in the IPv6 network change into callee's user name correspondence by the interface IP address of IPv6 gateway in the IPv4 net IPv6 address by gateway.
Further, specifically comprise during the SIP voice terminal initiation session of the SIP SIP voice terminal in the IPv6 network in the IPv4 network:
21, the calling party adds the IPv6 address that callee IPv4 map addresses goes out in the To header field of the sip message of initiation session, also comprises same address in Request-URI; In the From of this message header field, add calling party's user name and IPv6 address; Call-ID comprises the identifier of this calling in message header, and identifier is generated by a pseudorandom string and calling party's IPv6 address;
22, this sip message is sent to gateway in this IPv6 network; Gateway is handed to the SIP gateway with it;
23, the SIP gateway is reduced to the IPv4 address with the IPv6 address of callee among described sip message To header field and the Request-URI; The IPv6 address of calling party in the Call-ID item in From header field and the message header is changed to the interface IP address of IPv6 gateway in the IPv4 net; Media address among the Session Description Protocol SDP is also changed to the interface IP address of IPv6 gateway in the IPv4 net; If the length of SDP payload has been changed in this modification that the SDP payload is carried out, then the message content length field in the sip message head is also carried out corresponding modification;
24, the SIP gateway is transmitted to the callee who is in the IPv4 network with this amended sip message.
Further, specifically comprise during the SIP voice terminal initiation session of the SIP SIP voice terminal in the IPv4 network in the IPv6 network:
31, the calling party initiation session the To header field of sip message in add callee's the user name and the interface IP address of gateway in the IPv4 network of its place IPv6 network, also comprise same address among the Request-URI of this message; In the From of this message header field, add the user name and the IPv4 address of transmit leg; Call-ID comprises the identifier of this calling in the message header of this message, and identifier is generated by the IPv4 address of a pseudorandom string and calling party A4;
32, this sip message is sent to gateway in the IPv6 network of callee place; Gateway is handed to the SIP gateway with it;
33, the SIP gateway is searched corresponding IPv6 address according to the user name of callee in the To header field of the sip message head of receiving; Replace the To header field of sip message head and the IPv4 address among the Request-URI with the IPv6 address that finds; The IPv4 address of calling party in the Call-ID item in From header field and the message header is replaced with the IPv6 address that maps out; Media address among the Session Description Protocol SDP is also changed the IPv6 address that IPv4 map addresses for this reason goes out; If the length of SDP payload has been changed in this modification that the SDP payload is carried out, then the message content length field in the sip message head is also carried out corresponding modification;
34, the SIP gateway is transmitted to the callee with amended sip message.
Further, described method also comprises:
The SIP gateway is safeguarded the session mapping table that is used for writing down all SIP voice terminal current talking states of place IPv6 network, behind the sip message of receiving initiation session, in described session mapping table, write down the mapping relations of caller, called party address, and revise the talking state of the SIP voice terminal in the corresponding IPv6 network;
The user name of each SIP voice terminal in the IPv6 network of place and the corresponding relation of its IPv6 address are arranged in the described session mapping table, and the SIP gateway is searched the pairing IPv6 of SIP voice terminal user name address in the IPv6 network by described session mapping table.
The present invention also provides the method for a kind of IPv6 of realization and the speech communication of the IPv4 network terminal, comprising:
A, session establishment phase;
During the SIP voice terminal initiation session of the SIP SIP voice terminal in the IPv6 network in the IPv4 network: with the IPv6 address that called party address was mapped out is the sip message that target sends initiation session; By gateway with the SIP voice terminal address in the IPv6 network in this message change the interface IP address of IPv6 gateway in IPv4 net into, the recipient is issued after being reduced to the IPv4 address by the IPv6 address that maps out in SIP voice terminal address in the IPv4 network;
During the SIP voice terminal initiation session of the SIP voice terminal in the IPv4 network in the IPv6 network, be the sip message that target sends initiation session with callee's user name and the interface IP address of IPv6 gateway in the IPv4 net; Issue the recipient after changing the IPv4 address of the SIP voice terminal in the IPv4 network in this message into its IPv6 address that is mapped to, SIP voice terminal address in the IPv6 network change into callee's user name correspondence by the interface IP address of IPv6 gateway in the IPv4 net IPv6 address by gateway;
B, set up when callee's response session, and after the calling party confirmed, session was set up; The SIP gateway is in the mapping relations of setting up after the affirmation message of transmitting the calling party between " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP ";
In C, the communication process, after the IPv6 network gateway receives packet, according to the mapping relations between described the IPv6 address and the port numbers of VoP " receive " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP ", mail to destination address after the source in the packet, destination address changed;
D, send the sip message that finishes conversation, and the opposing party confirms the back end of conversation as a side.
Further, in the steps A, specifically comprise during the SIP voice terminal initiation session of the SIP SIP voice terminal in the IPv6 network in the IPv4 network:
61, the calling party adds the IPv6 address that callee IPv4 map addresses goes out in the To header field of the sip message of initiation session, also comprises same address in Request-URI; In the From of this message header field, add calling party's user name and IPv6 address; Call-ID comprises the identifier of this calling in message header, and identifier is generated by a pseudorandom string and calling party's IPv6 address;
62, this sip message is sent to gateway in this IPv6 network; Gateway is handed to the SIP gateway with it;
63, the SIP gateway is reduced to the IPv4 address with the IPv6 address of callee among described sip message To header field and the Request-URI; The IPv6 address of calling party in the Call-ID item in From header field and the message header is changed to the interface IP address of IPv6 gateway in the IPv4 net; Media address among the Session Description Protocol SDP is also changed to the interface IP address of IPv6 gateway in the IPv4 net; If the length of SDP payload has been changed in this modification that the SDP payload is carried out, then the message content length field in the sip message head is also carried out corresponding modification;
64, the SIP gateway is transmitted to the callee who is in the IPv4 network with this amended sip message.
Further, in the steps A, specifically comprise during the SIP voice terminal initiation session of the SIP SIP voice terminal in the IPv4 network in the IPv6 network:
71, the calling party initiation session the To header field of sip message in add callee's the user name and the interface IP address of gateway in the IPv4 network of its place IPv6 network, also comprise same address among the Request-URI of this message; In the From of this message header field, add the user name and the IPv4 address of transmit leg; Call-ID comprises the identifier of this calling in the message header of this message, and identifier is generated by the IPv4 address of a pseudorandom string and calling party A4;
72, this sip message is sent to gateway in the IPv6 network of callee place; Gateway is handed to the SIP gateway with it;
73, the SIP gateway is searched corresponding IPv6 address according to the user name of callee in the To header field of the sip message head of receiving; Replace the To header field of sip message head and the IPv4 address among the Request-URI with the IPv6 address that finds; The IPv4 address of calling party in the Call-ID item in From header field and the message header is replaced with the IPv6 address that maps out; Media address among the Session Description Protocol SDP is also changed the IPv6 address that IPv4 map addresses for this reason goes out; If the length of SDP payload has been changed in this modification that the SDP payload is carried out, then the message content length field in the sip message head is also carried out corresponding modification;
74, the SIP gateway is transmitted to the callee with amended sip message.
Further, described method also comprises:
The SIP gateway is safeguarded the session mapping table that is used for writing down all SIP voice terminal current talking states of place IPv6 network; The user name of each SIP voice terminal in the IPv6 network of place and the corresponding relation of its IPv6 address are arranged in the described session mapping table;
In the steps A, receive the sip message of initiation session when the SIP gateway after, mapping relations of record caller, called party address in described session mapping table, and revise the talking state of the SIP voice terminal in the corresponding IPv6 network; The SIP gateway is searched the pairing IPv6 of SIP voice terminal user name address in the IPv6 network by described session mapping table;
Among the step B, the SIP gateway writes down the port numbers of the SIP voice terminal in the IPv6 network in the session mapping table according to response message or acknowledge message; The SIP gateway is revised the talking state of the SIP voice terminal in the corresponding IPv6 network in the session mapping table after transmitting calling party's affirmation message, and sets up mapping relations between described " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " according to the session mapping table;
Among the step D, the SIP gateway is revised the talking state of the SIP voice terminal in the corresponding IPv6 network in the session mapping table after transmitting described acknowledge message.
Further, described step C comprises:
91, the IPv6 gateway is received packet;
92, for from IPv6 network destined IPv4 output packet, SIP voice terminal address in the IPv4 network is reduced to the IPv4 address by the IPv6 address that maps out, the SIP voice terminal address in the IPv6 network is replaced with the IPv4 interface IP address of IPv6 network gateway according to described mapping relations;
For from IPv4 network destined IPv6 output packet, with the IPv4 map addresses of the SIP voice terminal in the IPv4 network is the IPv6 address, changes the SIP voice terminal address in the IPv6 network into the pairing IPv6 of destination slogan address by the interface IP address of IPv6 gateway in the IPv4 net according to described mapping relations;
93, packet is mail to destination address.
The present invention also provides the equipment of a kind of IPv6 of realization and the speech communication of the IPv4 network terminal, comprises IPv6 network gateway and SIP gateway;
Described IPv6 network gateway is used for receiving sip message at session establishment phase, and it is transmitted to the SIP gateway; Also be used for according to the mapping relations between " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " the corresponding source of packet, destination address being mail to destination address after changing at speech phase;
Described SIP gateway is used for receiving the sip message that the IPv6 network gateway is transmitted at session establishment phase, is forwarded to the recipient after address information is wherein changed, and conversion specifically comprises:
During the SIP voice terminal initiation session of the SIP SIP voice terminal in the IPv6 network in the IPv4 network: with the SIP voice terminal address in the IPv6 network in this message change the interface IP address of IPv6 gateway in the IPv4 net into, the SIP voice terminal address in the IPv4 network is reduced to the IPv4 address by the IPv6 address that maps out;
During the SIP voice terminal initiation session of the SIP voice terminal in the IPv4 network in the IPv6 network, change the IPv4 address of the SIP voice terminal in the IPv4 network in this message into its IPv6 address that is mapped to, SIP voice terminal address in the IPv6 network are changed into callee's user name correspondence by the interface IP address of IPv6 gateway in the IPv4 net IPv6 address.
Described SIP gateway also is used for setting up the mapping relations between " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " and it is kept at the gateway of described IPv6 network after session is set up.
Further, described IP network gateway speech phase according to the mapping relations between the IPv6 address and the port numbers of VoP " receive " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " to packet in accordingly source, destination address conversion be meant:
For from IPv6 network destined IPv4 output packet, SIP voice terminal address in the IPv4 network is reduced to the IPv4 address by the IPv6 address that maps out, the SIP voice terminal address in the IPv6 network is replaced with the IPv4 interface IP address of IPv6 network gateway according to described mapping relations;
For from IPv4 network destined IPv6 output packet, with the IPv4 map addresses of the SIP voice terminal in the IPv4 network is the IPv6 address, changes the SIP voice terminal address in the IPv6 network into the pairing IPv6 of destination slogan address by the interface IP address of IPv6 gateway in the IPv4 net according to described mapping relations.
Further, the SIP gateway also is used for the session mapping table of all SIP voice terminal current talking states of maintenance record place IPv6 network; The user name of each SIP voice terminal in the IPv6 network of place and the corresponding relation of its IPv6 address are arranged in the described session mapping table;
After the SIP gateway also is used to receive the sip message of initiation session, in described session mapping table, write down the mapping relations of caller, called party address, and revise the talking state of the SIP voice terminal in the corresponding IPv6 network; And the talking state of after back and conversation end are set up in session, revising the SIP voice terminal in the corresponding IPv6 network in the session mapping table;
The SIP gateway also is used for the port numbers according to the response message of initiation session or the acknowledge message SIP voice terminal in session mapping table record IPv6 network, and sets up mapping relations between described " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " according to the session mapping table;
The SIP gateway is searched the pairing IPv6 of SIP voice terminal user name address in the IPv6 network according to described session mapping table.
After adopting technical scheme of the present invention, can realize the network terminal in a plurality of network terminals and other IPv4 network in the IPv6 network, based on Session Initiation Protocol, under the situation of only using an IPv4 address, carry out speech communication simultaneously, and, solved the problem that the SIP voice terminal of only supporting IPv4 in the IPv4 network makes a call in the SIP opposite end in the IPv6 network under the situation of not using domain name according to the special character of the IPv6 network islands that does not have domain name.
Description of drawings
Fig. 1 is the communication schematic diagram of the SIP voice terminal in the SIP voice terminal in the IPv6 network and the external IP v4 network in the prior art;
Fig. 2 is the schematic diagram that A4 sends INVITE in the application example of the present invention to A6;
Fig. 3 is the flow chart that overall process was set up, converses, finished in session in the application example of the present invention
Fig. 4 is the schematic diagram that A6 sends out OK message in the application example of the present invention to A4;
Fig. 5 is the schematic diagram of normal speech phase in the application example of the present invention.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
Core concept of the present invention is: increase a network equipment in the two stack gateways of the IPv6/IPv4 of IPv6 network, for convenient hereinafter explanation, be referred to as the SIP gateway; And the SIP gateway safeguards that a session mapping table that is used for writing down all SIP voice terminal current talking states of IPv6 network is as follows thus:
Table 1, session mapping table one
| Sequence number | IPv6 address/user name in the IPv6 network/port numbers | The outer session opposite end of IPv6 network IPv4 address/user name/port numbers | The session initiator | The current sessions state |
| 1 | 2880:5E34:2053:FF:50AB:3F50/A6/8888 | 202.117.30.27/A4/2323 | A6 | During session is set up |
| 2 | 2880:5E34::23FF:FEAB:20/B6/9999 | 202.117.30.53/B4/4545 | B6 | In the |
| 3 | 2880:5E34:0531:EF:2EAB:35/C6/null | Do not have | Do not have | Not conversation |
| 4 | …… | …… | …… | …… |
By the session mapping table that in gateway, increases at this, SIP gateway and NAPT-PT cooperatively interact, realize the network terminal in a plurality of network terminals and other IPv4 network in the IPv6 network with this,, under the situation of only using an IPv4 address, carry out speech communication simultaneously based on Session Initiation Protocol.
SIP gateway in the IPv6 network plays the effect of a kind of transition and transfer in the process of setting up, normal talking process and the end of conversation process of the conversation of IPv6 network inside and outside.This SIP gateway is inquired about in the session mapping table according to the source address and the port numbers of SIP packet.For sip message, this SIP gateway is changed content in the sip message that this SIP packet comprises according to the address, opposite end that inquires.Thereby realize that the VoIP opposite end based on SIP that all SIP voice terminals in the entire I Pv6 network can be under the situation of only using an IPv4 address be arranged in the IPv4 network with its outside simultaneously converses.Both session communications are carried out with this in the address, opposite end that provides session to set up with " interface IP address of Yong Huming @IPv6 network gateway in the IPv4 network " form SIP voice terminal in the IPv4 network under the situation of not using domain name simultaneously.For the IPv4 network of outside, the different SIP voice terminal in the IPv6 network is to distinguish with different user names.
SIP voice terminal in the IPv6 network uses different port numbers to receive the packet of the voice-bearer of the session opposite end transmission in the IPv4 network respectively.So, for the session opposite end in the IPv4 network, the recipient that they distinguish the packet of voice-bearer by identical destination address and different destination slogan (during conversation) or user name (when setting up session) is that SIP voice terminal in the IPv6 network actually.So should avoid the SIP voice terminal in the IPv6 network to use identical port numbers to receive the packet of the voice-bearer of the session opposite end transmission in the IPv4 network, that is to say, should be unique in the IPv6 network of port numbers under it for each SIP voice terminal distribution.
The invention provides the method for a kind of IPv6 of realization and the speech communication of the IPv4 network terminal, may further comprise the steps:
(1) session establishment phase.
During the SIP voice terminal initiation session of the SIP voice terminal in the IPv6 network in the IPv4 network, be the sip message (such as INVITE) that target sends initiation session with the IPv6 address that called party address was mapped out; Gateway in the IPv6 network is transmitted to the SIP gateway with it after receiving this sip message; After the SIP gateway is received sip message, address information is wherein changed the back transmit; The conversion of being carried out specifically comprises: change the SIP voice terminal address in the IPv6 network in the message interface IP address of IPv6 gateway in the IPv4 net into, the SIP voice terminal address in the IPv4 network in the message is reduced to the IPv4 address by the IPv6 address that maps out.
During the SIP voice terminal initiation session of the SIP voice terminal in the IPv4 network in the IPv6 network, be the sip message that target sends initiation session with callee's user name and the interface IP address of IPv6 gateway in the IPv4 net; Gateway in the IPv6 network is transmitted to the SIP gateway with it after receiving this sip message; After the SIP gateway is received sip message, address information is wherein changed the back transmit; The conversion of being carried out specifically comprises: change the IPv4 address of the SIP voice terminal in the IPv4 network in the message into IPv6 address that it is mapped to, the SIP voice terminal address in the IPv6 network in the message is changed into the IPv6 address of callee's user name correspondence by the interface IP address of IPv6 gateway in the IPv4 net.
Further, the SIP gateway is set up caller, called party's address mapping relation in the session mapping table, revises the call-information of each terminal.
(2) when the foundation of callee's response session (such as replying OK message), and after the calling party confirms (such as replying ACK message), session is set up, and the SIP gateway writes down the port numbers of the SIP voice terminal in the IPv6 network in the session mapping table according to response message or acknowledge message; The SIP gateway is set up the mapping relations between " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " according to the session mapping table after transmitting calling party's affirmation message; These mapping relations can but be not limited to the NAPT-PT mapping item; Also need to change the corresponding contents in the session mapping table.
(3) in the communication process, the SIP voice terminal in the IPv6 network is distinguished with port numbers;
After the IPv6 network gateway receives packet, according to the mapping relations between described " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP ", source in the packet, destination address are changed the back transmit, the conversion of being carried out specifically comprises:
For from IPv6 network destined IPv4 output packet, SIP voice terminal address in the IPv4 network is reduced to the IPv4 address by the IPv6 address that maps out, the SIP voice terminal address in the IPv6 network is replaced with the IPv4 interface IP address of IPv6 network gateway according to described mapping relations;
For from IPv4 network destined IPv6 output packet, with the IPv4 map addresses of the SIP voice terminal in the IPv4 network is the IPv6 address, changes the SIP voice terminal address in the IPv6 network into the pairing IPv6 of destination slogan address by the interface IP address of IPv6 gateway in the IPv4 net according to described mapping relations.
(4) send the sip message that finishes conversation as a side, such as BYE message, and the opposing party confirms (such as replying ACK message) back end of conversation; Mapping relations between SIP gateway deletion after transmitting described acknowledge message described " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP "; Also need to change the corresponding contents in the session mapping table.
The present invention also provides the method for setting up session between a kind of IPv6 of realization and the IPv4 network terminal, as above-mentioned step (1).
To be elaborated respectively according to different phase and situation below.
With the SIP voice terminal A4 initiation session of the SIP voice terminal A6 in the IPv6 network in outside IPv4 network is example, comprises the following steps:
A, calling party SIP voice terminal A6 make up the sip message of an initiation session, such as INVITE, in the To header field of this message, add IPv6 address that the IPv4 map addresses of callee A4 goes out i.e. " 0::IPv4 address ", also comprise same address among the Request-URI of this message.In the From of this message header field, add user name and the IPv6 address of calling party A6.Call-ID has comprised the identifier of this calling in the message header, and identifier is generated by the IPv6 address of a pseudorandom string and calling party A6.
B, A6 send to gateway in this IPv6 network with this sip message.Because the relevant message of regulation SIP is wanted use side slogan 5060 in the udp protocol, so gateway can come the bag for SIP gateway identification SIP by the destination slogan 5060 of packet.When gateway is received the sip message of A6, have specific destination slogan 5060 and it is handed to the SIP gateway because carry the SIP bag of this message.
After C, SIP gateway are received the sip message of A6, need finish following three steps:
C1, SIP gateway are at first noted the mapping relations of the IPv4 address of the IPv6 address of this message originator A6 and message receiver A4 in the session mapping table, and fill in other content as shown in table 1, as calling party and current sessions state.
After C2, session mapping table were set up and finished, the SIP gateway need be made amendment to the SIP bag that carries this sip message.For the message header of sip message, the IPv6 address that the IPv4 map addresses of callee A4 in the To header field need be gone out is reduced to the IPv4 address, and the same address that comprises among the Request-URI also will be reduced.IPv6 address with A6 in the From header field changes to the interface IP address of IPv6 gateway in the IPv4 net then.Simultaneously, in the message header in the Call-ID item IPv6 address of calling party A6 need to change to the interface IP address of gateway in the IPv4 net too.For the message body of sip message, media address in the media information of SDP (Session Description Protocol) the conversation description part and address style also need to change to the interface IP address of IPv6 gateway in the IPv4 net.The length of SDP payload is changed in this modification that the SDP payload is carried out possibly, so the message content length field in the sip message head also must be carried out corresponding modification.
After C3, modification were finished, the SIP gateway was transmitted to the recipient who is in the IPv4 network with this amended sip message, i.e. SIP voice terminal A4 in this example.
With the SIP voice terminal A6 initiation session of the SIP voice terminal A4 in the IPv4 network in the IPv6 network is example, as shown in Figure 2, may further comprise the steps:
A, calling party's SIP voice terminal A4 make up an initiation session sip message (such as INVITE), in the To header field of this message, add the user name of callee A6 and the interface IP address of gateway in the IPv4 network of its place IPv6 network, also comprise same address among the Request-URI of this message; In the From of this message header field, add user name and the IPv4 address of transmit leg A4.Call-ID has comprised the identifier of this calling in the message header of this message, and identifier is generated by the IPv4 address of a pseudorandom string and calling party A4.
B, A4 send to gateway in the IPv6 network of callee place with this sip message.When gateway is received the sip message of A4, have specific destination slogan 5060 and it is handed to the SIP gateway because carry the SIP bag of this message.
After c, SIP gateway are received the sip message of A4, need finish following five steps:
C1, SIP gateway are searched A6 according to the user name of the A6 in the To header field of the sip message head of receiving in the session mapping table of SIP gateway as shown in table 1 IPv6 address; And in this session mapping table the mapping relations of the IPv4 address of the record IPv6 address of A6 and A4, and fill in other content as shown in table 1.
IPv4 address in the To header field of the IPv6 address replacement sip message head of the A6 that c2, usefulness find; Also will equally revise among the Request-URI.
C3, the IPv4 address in the Call-ID item in the message header replaced with the IPv6 address that maps out.
C4, change the IPv4 address of the A4 in the From header field into IPv6 address that this IPv4 map addresses goes out.For the message body of sip message, the media address in the media information of the SDP conversation description part also needs to change the IPv6 address that IPv4 map addresses for this reason goes out.The length of SDP payload is changed in this modification that the SDP payload is carried out possibly, so the message content length field in the sip message head also must be carried out corresponding modification.
C5, SIP gateway are transmitted to SIP voice terminal A6 with amended sip message.
In the normal talking process, both sides send out message mutually by Real-time Transport Protocol (Real-time Transport Protocol, real time transport protocol) and converse.The packet of voice-bearer comes the border of passing through IPv 6 and IPv4 by the NAPT-PT agreement at this moment.To send the process of UDP (User Datagram Protoco (UDP)) packet that is carrying voice messaging as follows to its IPv4 opposite end SIP voice terminal A4 outside the network of being positioned at for the SIP voice terminal A6 that is arranged in the IPv6 network:
The first step, IPv6 address and receiving port number that SIP voice terminal A6 extends this as A6 respectively with the source address and the source port number of this packet, and destination address and destination slogan extend this as IPv6 address that the IPv4 map addresses of session opposite end A4 goes out and the receiving port number of A4 respectively, send to the NAPT-PT of IPv6 network gateway then;
Second step, the NAPT-PT of IPv6 network gateway replaces source address according to " A6 plans to receive the IPv6 address and the port numbers of VoP " set up and the mapping relations of " the IPv4 interface IP address of IPv6 network gateway and A6 plan to receive the port numbers of VoP ", if source port number difference then replace, identically then can not replace, and destination address is reduced to the IPv4 address of A4, transmit then.
In the normal talking process, it is as follows to the process that its SIP voice terminal A6 opposite end that is positioned at the IPv6 network sends the UDP message bag that is carrying voice messaging to be arranged in the outer IPv4SIP voice terminal A4 of Ipv6 network:
The first step, IPv4 address and receiving port number that SIP voice terminal A4 extends this as A4 respectively with the source address and the source port number of this packet, destination address and destination slogan extend this as the interface IP address of IPv6 network in IPv4 and the receiving port number of A6 respectively.
Second step, behind NAPT-PT through the IPv6 network gateway, the destination address of this packet and destination slogan change to IPv6 address and the receiving port number of A6 respectively according to " A6 plans to receive the IPv6 address and the port numbers of VoP " and the mapping relations of " the IPv4 interface IP address of IPv6 network gateway and A6 plan to receive the port numbers of VoP ", if the interface end slogan does not become, then can not replace, source address changes to the IPv6 address that the IPv4 map addresses of A4 goes out, and transmits then.
Description to the session mapping table safeguarded by the SIP gateway:
Content in the session mapping table has reflected the current talking state of all SIP voice terminals in the IPv6 network.
Each SIP voice terminal in the IPv6 network all can remain with one in the session mapping table, and no matter whether this SIP voice terminal is conversed, also whether carried out conversation regardless of this SIP voice terminal; At least user name and its IPv6 address of comprising the IPv6 terminal in this
When the SIP voice terminal in SIP voice terminal in the IPv6 network and the external IP v4 network is conversed, fill in promoter, the current sessions state of mapping relations and session, session both sides' address information in can be in the session mapping table corresponding list item, so that search.
When the SIP voice terminal in SIP voice terminal in the IPv6 network and the external IP v4 network finishes conversation, should be with the mapping relations deletion of corresponding list item in the session mapping table.Deletion herein is not meant the whole deletion of this mapping item.But only with wherein three in this mapping item: the outer IPv4 address, session opposite end of IPv6 network, calling party, current sessions state are rewritten as nothing, nothing, talking state not respectively; But the user name, port numbers and the IPv6 address that keep the SIP voice terminal in the IPv6 network.
The present invention also provides the equipment of a kind of IPv6 of realization and the speech communication of the IPv4 network terminal, comprises IPv6 network gateway and SIP gateway;
Described IPv6 network gateway is used for receiving sip message at session establishment phase, and it is transmitted to the SIP gateway; Also be used for according to the mapping relations between " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " the corresponding source of UDP message bag, destination address being mail to destination address after changing at speech phase.
Described SIP gateway is used for after session establishment phase receives the sip message of IPv6 network gateway forwarding, is forwarded to the recipient after address information is wherein changed, and can also be used for the maintain sessions mapping table, revises wherein ticket call information; Also be used for after session is set up, set up mapping relations between one the IPv6 address and the port numbers of VoP " receive " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " according to the session mapping table, and these mapping relations are kept in the IPv6 gateway.
At least comprise the user name of IPv6 terminal and its IPv6 address in the described session mapping table according to the user name of IPv6 terminal in the session mapping table and the mapping relations of its IPv6 address.
Described in the concrete grammar of the address transition method as mentioned, repeat no more.
Further be illustrated with an application example of the present invention below.
Three SIP voice terminal A6, B6 and C6 based on IPv6 are arranged in the IPv6 network among Fig. 1.Suppose wherein B6 and be in that opposite end B4 converses in the IPv4 net, C6 converses, SIP voice terminal A4 wants and A6 sets up conversation and be in this moment in the IPv4 net.The content of the session mapping table of this moment is as shown in table 2.
Table 2, session mapping table two
| Sequence number | IPv6 address/user name in the IPv6 network/port numbers | The outer session opposite end of IPv6 network IPv4 address/user name/port numbers | The session initiator | The current sessions state |
| 1 | 2880:5E34:2053:FF:50AB:3F50/A6/null | Do not have | Do not have | Not conversation |
| 2 | 2880:5E34::23FF:FEAB:20/B6/8888 | 202.117.30.53/B4/4545 | B6 | In the |
| 3 | 2880:5E34:0531:EF:2EAB:35/C6/null | Do not have | Do not have | Not conversation |
| 4 | …… | …… | …… | …… |
Even if it should be noted that in table 2 and converse, each the SIP voice terminal in the IPv6 network all can remain with one (as SIP voice terminal C6) in the session mapping table.The purpose of doing like this is the processing when being convenient to the outer SIP voice terminal of the SIP voice terminal of only supporting IPv4 in the IPv6 network of IPv6 network and initiatively making a call.
The IP address of these SIP voice terminals is seen shown in Fig. 1.Gateway in the IPv6 network is the equipment with the two stacks of IPv6/v4, and its interface IP address in the IPv6 network is 2880:5E34::27AB:FA82:3, and the interface IP address in the IPv4 public network is 202.117.30.15.
To describe the process in each stage when the SIP voice terminal in the outside IPv4 network initiatively initiates a session request below in detail, as shown in Figure 3.
Session establishment phase may further comprise the steps:
Should be under the call address normal condition of the SIP voice terminal in the IPv6 network for the form of " Yong Huming @IPv6 address ", such as A6@2880:5E34:2053:FF:50AB:3F50.But the SIP voice terminal in the IPv4 network is not support the IPv6 address.So come the SIP voice terminal in the IPv4 public network to provide and to handle and leave the conversion work of address for the IPv6 network gateway for the address of calling out with the form (as A6@202.117.30.15) of " interface IP address of Yong Huming @IPv6 network gateway in the IPv4 network ".This shows that for the IPv4 network of outside, when setting up session, the different SIP voice terminal in the IPv6 network is to distinguish with different user names.
When the SIP voice terminal of the SIP voice terminal of only supporting IPv4 in the IPv6 network outside the IPv6 network initiatively makes a call, initiatively make a call to SIP voice terminal A6 such as SIP voice terminal A4 among Fig. 1, A4 can send the INVITE invitation message to A6@202.117.30.15.
It should be noted that: (1) address 202.117.30.15 herein is the interface IP address of IPv6 network gateway in the IPv4 network; (2), then send the INVITE invitation message to B6@202.117.30.15 if make a call to B6.The IPv6 network is distinguished the different SIP voice terminal of IPv6 network internal with same IPv4 address 202.117.30.15 with different user names (as A6 and B6).
The structure of INVITE, as shown in Figure 2, A4 at first creates an INVITE request, adds A6@202.117.30.15 in To header field, also comprises same address among the Request-URI.
In the From header field, add name and IPv4 address, the i.e. sip:A4@202.117.30.27 of calling party A4.
Call-ID has comprised the identifier of this calling in the message header, and identifier is generated by the IPv4 address of a pseudorandom string and calling party A4.
A4 sends to gateway in this IPv6 network with this INVITE request then.After the gateway of IPv6 is received this INVITE because carry this message SIP bag port numbers 5060 and it is handed to the SIP gateway processes.The SIP gateway is used in the process IP v6 network setting up the problem of conversing, conversing, run in the finished call process with the outside SIP voice terminal that is in the IPv4 net based on the SIP voice terminal of IPv6 specially.During practical application, can but be not limited to occur as application module in the gateway of IPv6 network.
The SIP gateway need be finished following quadrinomial job after receiving the INVITE request of A4:
The first, the SIP gateway is searched in the session mapping table of SIP gateway as shown in table 2 according to the user name A6 among the To header field A6@202.117.30.15 of the INVITE head of receiving.After finding the list item of A6, see whether its current sessions status attribute is " not conversation ".
If this attribute is not " not conversation ", then return a Busy Here (486) message to initiator A4, the user that it is called out with notice A4 is current just busy.
If this attribute is " not conversation ", then at first the A6 list item in the session mapping table is made amendment.Respectively information such as the outer IPv4 address, session opposite end of the IPv6 network in the list item, calling party, current sessions state are rewritten as respectively address 202.117.30.27, the A4 of A4, converse medium.With these mapping relations of noting the IPv6 address of the IPv4 address of this INVITE initiator A4 and message receiver A6 in the session mapping table, it is as shown in table 3 to fill in the result.
Table 3, session mapping table three
| Sequence number | IPv6 address/user name in the IPv6 network/port numbers | The outer session opposite end of IPv6 network IPv4 address/user name/port numbers | The session initiator | The current sessions state |
| 1 | 2880:5E34:2053:FF:50AB:3F50/A6/null | 202.117.30.27/A4/5100 | A4 | During session is set up |
| 2 | 2880:5E34::23FF:FEAB:20/B6/8888 | 202.117.30.53/B4/4545 | B6 | In the |
| 3 | 2880:5E34:0531:EF:2EAB:35/C6/null | Do not have | Do not have | Not conversation |
| 4 | …… | …… | …… | …… |
The second, after the session mapping table was filled in and finished, the SIP gateway need be made amendment to the SIP bag that carries this INVITE.The SIP gateway must be made amendment each the SIP message that passes through the IPv4/IPv6 border.In this example, the IPv4 address in the To header field of the IPv6 address 2880:5E34:2053:FF:50AB:3F50 substitute I NVITE message header of the A6 that usefulness finds, the replacement result is A6@2880:5E34:2053:FF:50AB:3F50.The address that comprises among the Request-URI also will be changed as in the To territory.And the IPv6 address (being 0::202.117.30.27) that IPv4 map addresses for this reason goes out need be changed in the IPv4 address of A4 in From header field and the Call-ID item.The result of change as shown in Figure 2.
For the message body of INVITE, the media address in the media information of the SDP conversation description part also needs to change to the IPv6 address 0::202.117.30.27 that the IPv4 map addresses of A4 goes out.The length of SDP payload is changed in this modification that the SDP payload is carried out possibly, so the message content length field in the sip message head also must be carried out corresponding modification.
The 3rd, the SIP gateway is transmitted to SIP voice terminal A6 with amended INVITE.
The 4th, last SIP gateway need be constructed a Trying (100) message, and sends to the originating end SIP voice terminal A4 of SIP conversation request, tells originating end A4 INVITE to be sent with this, connects well afoot.
For the callee SIP voice terminal A6 that receives the INVITE that this in fact comes from A4@202.117.30.27, it and the opposite end of not knowing to call out it as a SIP voice terminal based on IPv4.It thinks that by analyzing this INVITE what call out it is A4@0::202.117.30.27 (by the From field in the message header).
After callee SIP voice terminal A6 received call request, it can accept or refuse this calling, but in any case all must echo reply.Before callee A6 call accepted, A6 can send Ringing (180) message to A4@0::202.117.30.27 and tell the calling party waiting for that the callee answers, and is current just in ring.It generates To by the INVITE request of receiving, From, and the thresholding of header fields such as Call-ID and CSeq makes up Ringing (180) message with this.
When callee A6 call accepted, an OK (200) response message can send to the session calling party A4@0::202.117.30.27 (the actual A4@202.117.30.27 of being) that it is thought, as shown in Figure 4.The construction method of OK (200) response message and Ringing previously discussed (180) are that similarly SDP wherein carries the port numbers of A6.
After the gateway of IPv6 is received this OK message, because of the port numbers 5060 of the SIP bag of this message of carrying it is handed to the SIP gateway processes equally.The SIP gateway need be finished following quadrinomial job:
The first, the SIP gateway is at first searched in the session mapping table of SIP gateway as shown in table 3 according to the To header field A4@0::202.117.30.27 of the OK message header of receiving, to find corresponding session entry.
The second, the SIP gateway is reduced into IPv4 address 202.117.30.27 with the IPv6 address 0::202.117.30.27 that the IPv4 map addresses of A4 in the To header field goes out.The IPv6 address of A6 in the From header field is changed to the interface IP address 202.117.30.15 of IPv6 network gateway in the IPv4 network, promptly be revised as A6@202.117.30.15.Other some header fields also will similarly be revised as shown in Figure 4.
The 3rd, among the SDP in the OK message, include the interface IP address and the port numbers that when good back normal talking is set up in session, are used to receive VoP.The SIP gateway is the interface IP address of IPv6 network gateway in the IPv4 network with the voice packet receiver address by the IPv6 address change of A6.And in the session mapping table, note the port numbers of appointment in the SDP of OK message, as shown in table 4.
The 4th, the SIP gateway sends to session originating end A4 with amended OK message bag.
Table 4, session mapping table four
| Sequence number | IPv6 address/user name in the IPv6 network/port numbers | The outer session opposite end of IPv6 network IPv4 address/user name/port numbers | The session initiator | The current sessions state |
| 1 | 2880:5E34:2053:FF:50AB:3F50/A6/9999 | 202.117.30.27/A4/5100 | Do not have | During session is set up |
| 2 | 2880:5E34::23FF:FEAB:20/B6/8888 | 202.117.30.53/B4/4545 | B6 | In the |
| 3 | 2880:5E34:0531:EF:2EAB:35/C6/null | Do not have | Do not have | Not conversation |
| 4 | …… | …… | …… | …… |
After calling party SIP voice terminal A4 receives the OK response message of callee A6, send the ACK authorization request to the callee.The process of transmitting of ACK authorization request is about the same with the INVITE that described calling party A4 before sends to callee A6, does not repeat them here.
But it is pointed out that the SIP gateway after having transmitted the ACK authorization request, can set up a NAPT-PT mapping item according to the session mapping table.Mapping relations are " IPv6 address and port numbers that A6 plans to receive VoP " and " the IPv4 interface IP address of IPv6 network gateway and A6 plan to receive the port numbers of VoP ".If the session with SIP voice terminal A6 and SIP voice terminal A4 is the i.e. mapping between (IPv6 address 2880:5E34:2053:FF:50AB:3F50, port numbers 9999) and (IPv4 address 202.117.30.15, port numbers 9999) of example, and is as shown in table 5.After this A4 and A6 just can directly receive and dispatch the packet of voice-bearer by NAPT-PT.
Table 5, NAPT-PT mapping table
| User name | Receive the IPv6 address and the port numbers of VoP | The IPv4 interface IP address of IPv6 network gateway and terminal receive the port numbers of VoP |
| A6 | 2880:5E34:2053:FF:50AB:3F50/A6/9999 | 202.117.30.15/9999 |
| B6 | 2880:5E34::23FF:FEAB:20/B6/8888 | 202.117.30.15/8888 |
| …… | …… | …… |
After callee A6 received ACK message, the session between calling and called was set up.So far, the SIP task of setting up session has just been finished.
After the SIP session was set up and finished, the SIP gateway can upgrade session mapping table as shown in table 4.The current sessions status items changes to " in the conversation " by " in the session foundation " in the clauses and subclauses that will be relevant with the A6 session with A4.
Normal speech phase may further comprise the steps:
During normal talking, both sides send out message mutually by Real-time Transport Protocol (Real-time Transport Protocol, real time transport protocol) and converse.The packet of voice-bearer comes the border of passing through IPv 6 and IPv4 by the NAPT-PT agreement at this moment.
Conversation with SIP voice terminal A6 and SIP voice terminal A4 is an example.As shown in Figure 5, when the SIP voice terminal A6 that is arranged in the IPv6 network sends when carrying the UDP message bag of voice messaging by the IPv4 opposite end SIP voice terminal A4 outside the IPv6 network of being positioned at of Real-time Transport Protocol to it, the source address of this packet and source port number are respectively the IPv6 address 2880:5E34:2053:FF:50AB:3F50 and 9999 of A6, and destination address and destination slogan are respectively the IPv6 address 0::202.117.30.27 and 5100 that the IPv4 map addresses of session opposite end A4 goes out.The mapping relations that the NAPT-PT of IPv6 network gateway sets up according to session establishment phase (2880:5E34:2053:FF:50AB:3F50 port numbers 9999 and 202.117.30.15 port numbers 9999) change to 202.117.30.15 and 9999 respectively with source address and source port number, and destination address is reduced to the IPv4 address 202.117.30.27 of A4, transmit then.
And the IPv4 opposite end SIP voice terminal A4 outside being arranged in the IPv6 network sends when carrying the UDP message bag of voice messaging to the SIP voice terminal A6 that is positioned at the IPv6 network by Real-time Transport Protocol, the source address of this packet and source port number are respectively the IPv4 address 202.117.30.27 and 5100 of A4, and destination address and destination slogan be 202.117.30.15 and 9999 respectively.The IPv6 address 0::202.117.30.27 and 5100 that the source address of this packet and IPv4 map addresses that source port number is respectively A4 go out after through the NAPT-PT of IPv6 network gateway, and destination address and destination slogan are respectively IPv6 address 2880:5E34:2053:FF:50AB:3F50 and the port numbers 9999 of A6.
The end of conversation stage may further comprise the steps:
After normal talking finished, either party of conversation can send " goodbye " (BYE) message to the other side, and request stops session.The recipient only needs Ack response of loopback, and then session just is through with.The processing procedure of the interacting message that these conversation end stages carry out, with previously described message processing procedure be similar.
Institute's difference is that behind end of conversation, the SIP gateway can restore the session mapping item of this session correspondence in the session mapping table, and is as shown in table 3.The SIP gateway can be with the NAPT-PT list item deletion (as shown in table 6) that is used for the receiving and transmitting voice packet of session establishment stage foundation then.So far, whole communication process finishes.
Table 6, A6 finish the NAPT-PT mapping table after the conversation
| User name | Receive the IPv6 address and the port numbers of VoP | The IPv4 interface IP address of IPv6 network gateway and terminal receive the port numbers of VoP |
| A6 | ||
| B6 | 2880:5E34::23FF:FEAB:20/B6/8888 | 202.117.30.15/8888 |
| …… | …… | …… |
To describe the process in each stage when the SIP voice terminal in the IPv6 network initiatively initiates a session request below in detail.
Session establishment phase may further comprise the steps:
Make a call to A4 with SIP voice terminal A6 and to be that example, A6 at first create INVITE request.The IPv4 map addresses of adding callee A4 in To header field has gone out IPv6 address 0::202.117.30.27, also comprises same address among the Request-URI.
In the From header field, add name and IPv6 address, the i.e. sip:A6@2880:5E34:2053:FF:50AB:3F50 of calling party A6.Should be noted that differently with ordinary circumstance herein, calling party's IPv6 address all can be replaced to an identical IPv4 address by the SIP gateway in the From header field after by the IPv6 network gateway.So in order to distinguish SIP voice terminals different in the IPv6 network, calling party's name can not be identical in the From header field.That is to say that each the SIP voice terminal in the IPv6 network need play different user names.
Call-ID has comprised the identifier of this calling in the message header, and identifier is generated by the IPv6 address of a pseudorandom string and calling party A6.
A6 sends to IPv6 network gateway in this IPv6 network with this INVITE request then.The IPv6 network gateway comes to be SIP gateway identification sip message bag by the destination slogan 5060 of packet.When the IPv6 network gateway is received INVITE when request of A6, be 5060 and it is handed to the SIP gateway because carry the destination slogan of the SIP bag of this message.
The SIP gateway need be finished following quadrinomial job after receiving the INVITE request of A6:
The first, the SIP gateway is at first noted the mapping relations of the IPv4 address of the IPv6 address of this INVITE initiator A6 and message receiver A4 in the session mapping table, and fills in other content as shown in table 1.
The second, after the session mapping table was set up and finished, the SIP gateway need be made amendment to the SIP bag that carries this INVITE.In this example, message header for INVITE, the IPv4 map addresses of callee A4 in the To header field need have been gone out IPv6 address 0::202.117.30.27 and be reduced to IPv4 address 202.117.30.27, the same address that comprises among the Request-URI also will be reduced.The IPv6 address of A6 changes to the interface IP address 202.117.30.15 of IPv6 network gateway in the IPv4 net in the From header field.Simultaneously, in the message header in the Call-ID item IPv6 address of calling party A6 need to change to the interface IP address 202.117.30.15 of IPv6 network gateway in the IPv4 net too.
For the message body of INVITE, the media address in the media information of the SDP conversation description part also needs to change to the address 202.117.30.15 of IPv6 network gateway in the IPv4 net.The length of SDP payload is changed in this modification that the SDP payload is carried out possibly, so the message content length field in the sip message head also must be carried out corresponding modification.Why will carry out these changes is because only support that the receiving terminal of IPv4 can't process IP v6 address.
The 3rd, after modification was finished, the SIP gateway was transmitted to the callee who is in the IPv4 network with this amended INVITE, i.e. SIP voice terminal A4 in this example.
The 4th, last SIP gateway need be constructed a Trying (100) message, and sends to the originating end SIP voice terminal A6 of SIP conversation request, tells originating end A6 INVITE to be sent with this, connects well afoot.
For the callee SIP voice terminal A4 that receives the INVITE that this in fact comes from A6@2880:5E34:2053:FF:50AB:3F50, it and the opposite end of not knowing to call out it as a SIP voice terminal based on IPv6.It thinks that by analyzing this INVITE what call out it is A6@202.117.30.15 (by the From field in the message header).
After callee SIP voice terminal A4 received call request, it can accept or refuse this calling, but in any case all must echo reply.Before callee A4 call accepted, A4 can send Ringing (180) message to A6@202.117.30.15 and tell the calling party waiting for that the callee answers, and is current just in ring.It generates To by the INVITE request of receiving, From, and the thresholding of header fields such as Cal-ID and CSeq makes up Ringing (180) message with this.
After the IPv6 network gateway is received this Ringing message, because of the port numbers 5060 of the SIP bag of this message of carrying it is handed to the SIP gateway processes equally.
At first, the SIP gateway is searched in the session mapping table of SIP gateway as shown in table 1 according to the To header field A6@202.117.30.15 of the Ringing message header of receiving.Replace the IPv4 address in the To header field of Ringing message header with the IPv6 address 2880:5E34:2053:FF:50AB:3F50 of the A6 that finds, the replacement result is A6@2880:5E34:2053:FF:50AB:3F50.Equally, the IPv4 address 202.117.30.15 in the Call-ID item also needs to replace with the IPv6 address 2880:5E34:2053:FF:50AB:3F50 of A6 in the message header.The From header field then needs the IPv6 address 0::202.117.30.27 that IPv4 map addresses is for this reason come out is changed in the IPv4 address of callee A4.Then, the SIP gateway is given SIP voice terminal A6 with amended Ringing forwards.
When callee A4 call accepted, an OK (200) response message can send to the session calling party A6@202.117.30.15 (the actual A6@2880:5E34:2053:FF:50AB:3F50 of being) that callee A4 thinks.The construction method and the Ringing previously discussed (180) of OK (200) response message are similar.
IPv6 network gateway and SIP gateway are received the also similar to the Ringing Message Processing of the processing carried out after this OK message and ubi supra.Difference is to have comprised the message body (adopting SDP to describe) that is used for the conversation media type and consults than Ringing message in the OK message more.The SIP gateway will from the OK message of IPv4 opposite end A4 with the media information part of SDP conversation description in media address and the address style IPv4 map addresses that the changes to A4 IPv6 address of coming out, (being the 0::IPv4 address).Equally, the length of SDP payload is changed in this modification that the SDP payload is carried out possibly, so the message content length field in the sip message head also must be carried out corresponding modification.Then, the SIP gateway is given SIP voice terminal A6 with amended OK forwards.
After calling party SIP voice terminal A6 receives callee's OK response message, send the ACK authorization request to the callee.The process of transmitting of ACK authorization request is about the same with the INVITE that described calling party A6 before sends to callee A4, does not repeat them here.It is pointed out that the SIP gateway after having transmitted the ACK authorization request, can set up a NAPT-PT mapping item.Mapping relations are " IPv6 address and port numbers that A6 plans to receive VoP " and " the IPv4 interface IP address of IPv6 network gateway and A6 plan to receive the port numbers of VoP ".After this A6 and A4 just can directly receive and dispatch the packet of voice-bearer by NAPT-PT.
After callee A4 received ACK message, the session between calling and called was set up.So far, the SIP task of setting up session has just been finished.
After the SIP session was set up and finished, the SIP gateway can upgrade the session mapping table.The current sessions status items changes to " in the conversation " by " in the session foundation " in the clauses and subclauses that will be relevant with the A4 session with A6.
During normal talking, both sides send out message mutually by Real-time Transport Protocol (Real-time Transport Protocol, real time transport protocol) and converse.The packet of voice-bearer comes the border of passing through IPv 6 and IPv4 by the NAPT-PT agreement at this moment.The situation that the IPv4 SIP voice terminal that processing when normal talking and front have been discussed initiatively makes a call is similar, repeats no more herein.
The situation that the IPv4 SIP voice terminal that the processing in end of conversation stage and front have been discussed initiatively makes a call is similar, repeats no more herein.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. a method that realizes setting up between the IPv6 and the IPv4 network terminal session is characterized in that, comprising:
During the SIP voice terminal initiation session of the SIP SIP voice terminal in the IPv6 network in the IPv4 network: with the IPv6 address that called party address was mapped out is the sip message that target sends initiation session; By gateway with the SIP voice terminal address in the IPv6 network in this message change the interface IP address of IPv6 gateway in IPv4 net into, the recipient is issued after being reduced to the IPv4 address by the IPv6 address that maps out in SIP voice terminal address in the IPv4 network;
During the SIP voice terminal initiation session of the SIP voice terminal in the IPv4 network in the IPv6 network: user name and the interface IP address of IPv6 gateway in the IPv4 net with the callee are the sip message that target sends initiation session; Issue the recipient after changing the IPv4 address of the SIP voice terminal in the IPv4 network in this message into its IPv6 address that is mapped to, SIP voice terminal address in the IPv6 network change into callee's user name correspondence by the interface IP address of IPv6 gateway in the IPv4 net IPv6 address by gateway;
The SIP gateway is safeguarded the session mapping table that is used for writing down all SIP voice terminal current talking states of place IPv6 network, behind the sip message of receiving initiation session, in described session mapping table, write down the mapping relations of caller, called party address, and revise the talking state of the SIP voice terminal in the corresponding IPv6 network; The user name of each SIP voice terminal in the IPv6 network of place and the corresponding relation of its IPv6 address are arranged in the described session mapping table, and the SIP gateway is searched the pairing IPv6 of SIP voice terminal user name address in the IPv6 network by described session mapping table.
2. the method for claim 1 is characterized in that, specifically comprises during the SIP voice terminal initiation session of the SIP voice terminal in the IPv6 network in the IPv4 network:
21, the calling party adds the IPv6 address that callee IPv4 map addresses goes out in the To header field of the sip message of initiation session, also comprises same address in Request-URI; In the From of this message header field, add calling party's user name and IPv6 address; Call-ID comprises the identifier of this calling in message header, and identifier is generated by a pseudorandom string and calling party's IPv6 address;
22, this sip message is sent to gateway in this IPv6 network; Gateway is handed to the SIP gateway with it;
23, the SIP gateway is reduced to the IPv4 address with the IPv6 address of callee among described sip message To header field and the Request-URI; The IPv6 address of calling party in the Call-ID item in From header field and the message header is changed to the interface IP address of IPv6 gateway in the IPv4 net; Media address among the Session Description Protocol SDP is also changed to the interface IP address of IPv6 gateway in the IPv4 net; If the length of SDP payload has been changed in this modification that the SDP payload is carried out, then the message content length field in the sip message head is also carried out corresponding modification;
24, the SIP gateway is transmitted to the callee who is in the IPv4 network with this amended sip message.
3. the method for claim 1 is characterized in that, specifically comprises during the SIP voice terminal initiation session of the SIP voice terminal in the IPv4 network in the IPv6 network:
31, the calling party initiation session the To header field of sip message in add callee's the user name and the interface IP address of gateway in the IPv4 network of its place IPv6 network, also comprise same address among the Request-URI of this message; In the From of this message header field, add the user name and the IPv4 address of transmit leg; Call-ID comprises the identifier of this calling in the message header of this message, and identifier is generated by a pseudorandom string and calling party's IPv4 address;
32, this sip message is sent to gateway in the IPv6 network of callee place; Gateway is handed to the SIP gateway with it;
33, the SIP gateway is searched corresponding IPv6 address according to the user name of callee in the To header field of the sip message head of receiving; Replace the To header field of sip message head and the IPv4 address among the Request-URI with the IPv6 address that finds; The IPv4 address of calling party in the Call-ID item in From header field and the message header is replaced with the IPv6 address that maps out; Media address among the Session Description Protocol SDP is also changed the IPv6 address that IPv4 map addresses for this reason goes out; If the length of SDP payload has been changed in this modification that the SDP payload is carried out, then the message content length field in the sip message head is also carried out corresponding modification;
34, the SIP gateway is transmitted to the callee with amended sip message.
4. a method that realizes IPv6 and the speech communication of the IPv4 network terminal is characterized in that, comprising:
A, session establishment phase;
During the SIP voice terminal initiation session of the SIP voice terminal in the IPv6 network in the IPv4 network: with the IPv6 address that called party address was mapped out is the sip message that target sends initiation session; By gateway with the SIP voice terminal address in the IPv6 network in this message change the interface IP address of IPv6 gateway in IPv4 net into, the recipient is issued after being reduced to the IPv4 address by the IPv6 address that maps out in SIP voice terminal address in the IPv4 network;
During the SIP voice terminal initiation session of the SIP voice terminal in the IPv4 network in the IPv6 network, be the sip message that target sends initiation session with callee's user name and the interface IP address of IPv6 gateway in the IPv4 net; Issue the recipient after changing the IPv4 address of the SIP voice terminal in the IPv4 network in this message into its IPv6 address that is mapped to, SIP voice terminal address in the IPv6 network change into callee's user name correspondence by the interface IP address of IPv6 gateway in the IPv4 net IPv6 address by gateway;
B, set up when callee's response session, and after the calling party confirmed, session was set up; The SIP gateway is in the mapping relations of setting up after the affirmation message of transmitting the calling party between " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP ";
In C, the communication process, after the IPv6 network gateway receives packet, according to the mapping relations between described the IPv6 address and the port numbers of VoP " receive " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP ", mail to destination address after the source in the packet, destination address changed;
D, send the sip message that finishes conversation, and the opposing party confirms the back end of conversation as a side;
The SIP gateway is safeguarded the session mapping table that is used for writing down all SIP voice terminal current talking states of place IPv6 network; The user name of each SIP voice terminal in the IPv6 network of place and the corresponding relation of its IPv6 address are arranged in the described session mapping table;
In the steps A, receive the sip message of initiation session when the SIP gateway after, mapping relations of record caller, called party address in described session mapping table, and revise the talking state of the SIP voice terminal in the corresponding IPv6 network; The SIP gateway is searched the pairing IPv6 of SIP voice terminal user name address in the IPv6 network by described session mapping table;
Among the step B, the SIP gateway writes down the port numbers of the SIP voice terminal in the IPv6 network in the session mapping table according to response message or acknowledge message; The SIP gateway is revised the talking state of the SIP voice terminal in the corresponding IPv6 network in the session mapping table after transmitting calling party's affirmation message, and sets up mapping relations between described " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " according to the session mapping table;
Among the step D, the SIP gateway is revised the talking state of the SIP voice terminal in the corresponding IPv6 network in the session mapping table after transmitting described acknowledge message.
5. method as claimed in claim 4 is characterized in that, in the steps A, specifically comprises during the SIP voice terminal initiation session of the SIP voice terminal in the IPv6 network in the IPv4 network:
51, the calling party adds the IPv6 address that callee IPv4 map addresses goes out in the To header field of the sip message of initiation session, also comprises same address in Request-URI; In the From of this message header field, add calling party's user name and IPv6 address; Call-ID comprises the identifier of this calling in message header, and identifier is generated by a pseudorandom string and calling party's IPv6 address;
52, this sip message is sent to gateway in this IPv6 network; Gateway is handed to the SIP gateway with it;
53, the SIP gateway is reduced to the IPv4 address with the IPv6 address of callee among described sip message To header field and the Request-URI; The IPv6 address of calling party in the Call-ID item in From header field and the message header is changed to the interface IP address of IPv6 gateway in the IPv4 net; Media address among the Session Description Protocol SDP is also changed to the interface IP address of IPv6 gateway in the IPv4 net; If the length of SDP payload has been changed in this modification that the SDP payload is carried out, then the message content length field in the sip message head is also carried out corresponding modification;
54, the SIP gateway is transmitted to the callee who is in the IPv4 network with this amended sip message.
6. method as claimed in claim 4 is characterized in that, in the steps A, specifically comprises during the SIP voice terminal initiation session of the SIP voice terminal in the IPv4 network in the IPv6 network:
61, the calling party adds callee's the user name and the interface IP address of gateway in the IPv4 network of its place IPv6 network in the To header field of the sip message of initiation session, also comprises same address among the Request-URI of this message; In the From of this message header field, add the user name and the IPv4 address of transmit leg; Call-ID comprises the identifier of this calling in the message header of this message, and identifier is generated by a pseudorandom string and calling party's IPv4 address;
62, this sip message is sent to gateway in the IPv6 network of callee place; Gateway is handed to the SIP gateway with it;
63, the SIP gateway is searched corresponding IPv6 address according to the user name of callee in the To header field of the sip message head of receiving; Replace the To header field of sip message head and the IPv4 address among the Request-URI with the IPv6 address that finds; The IPv4 address of calling party in the Call-ID item in From header field and the message header is replaced with the IPv6 address that maps out; Media address among the Session Description Protocol SDP is also changed the IPv6 address that IPv4 map addresses for this reason goes out; If the length of SDP payload has been changed in this modification that the SDP payload is carried out, then the message content length field in the sip message head is also carried out corresponding modification;
64, the SIP gateway is transmitted to the callee with amended sip message.
7. method as claimed in claim 4 is characterized in that, described step C comprises:
71, the IPv6 gateway is received packet;
72, for from IPv6 network destined IPv4 output packet, SIP voice terminal address in the IPv4 network is reduced to the IPv4 address by the IPv6 address that maps out, the SIP voice terminal address in the IPv6 network is replaced with the IPv4 interface IP address of IPv6 network gateway according to described mapping relations;
For from IPv4 network destined IPv6 output packet, with the IPv4 map addresses of the SIP voice terminal in the IPv4 network is the IPv6 address, changes the SIP voice terminal address in the IPv6 network into the pairing IPv6 of destination slogan address by the interface IP address of IPv6 gateway in the IPv4 net according to described mapping relations;
73, packet is mail to destination address.
8. an equipment of realizing IPv6 and the speech communication of the IPv4 network terminal is characterized in that: comprise IPv6 network gateway and SIP gateway;
Described IPv6 network gateway is used for receiving sip message at session establishment phase, and it is transmitted to the SIP gateway; Also be used for according to the mapping relations between " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " the corresponding source of packet, destination address being mail to destination address after changing at speech phase;
Described SIP gateway is used for receiving the sip message that the IPv6 network gateway is transmitted at session establishment phase, is forwarded to the recipient after address information is wherein changed, and conversion specifically comprises:
During the SIP voice terminal initiation session of the SIP voice terminal in the IPv6 network in the IPv4 network: with the SIP voice terminal address in the IPv6 network in this message change the interface IP address of IPv6 gateway in the IPv4 net into, the SIP voice terminal address in the IPv4 network is reduced to the IPv4 address by the IPv6 address that maps out;
During the SIP voice terminal initiation session of the SIP voice terminal in the IPv4 network in the IPv6 network, change the IPv4 address of the SIP voice terminal in the IPv4 network in this message into its IPv6 address that is mapped to, SIP voice terminal address in the IPv6 network are changed into callee's user name correspondence by the interface IP address of IPv6 gateway in the IPv4 net IPv6 address;
Described SIP gateway also is used for setting up the mapping relations between " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " and it is kept at the gateway of described IPv6 network after session is set up.
9. equipment as claimed in claim 8, it is characterized in that, described IP network gateway speech phase according to the mapping relations between the IPv6 address and the port numbers of VoP " receive " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " to packet in accordingly source, destination address conversion be meant:
For from IPv6 network destined IPv4 output packet, SIP voice terminal address in the IPv4 network is reduced to the IPv4 address by the IPv6 address that maps out, the SIP voice terminal address in the IPv6 network is replaced with the IPv4 interface IP address of IPv6 network gateway according to described mapping relations;
For from IPv4 network destined IPv6 output packet, with the IPv4 map addresses of the SIP voice terminal in the IPv4 network is the IPv6 address, changes the SIP voice terminal address in the IPv6 network into the pairing IPv6 of destination slogan address by the interface IP address of IPv6 gateway in the IPv4 net according to described mapping relations.
10. equipment as claimed in claim 8 is characterized in that:
The SIP gateway also is used for the session mapping table of all SIP voice terminal current talking states of maintenance record place IPv6 network; The user name of each SIP voice terminal in the IPv6 network of place and the corresponding relation of its IPv6 address are arranged in the described session mapping table;
After the SIP gateway also is used to receive the sip message of initiation session, in described session mapping table, write down the mapping relations of caller, called party address, and revise the talking state of the SIP voice terminal in the corresponding IPv6 network; And the talking state of after back and conversation end are set up in session, revising the SIP voice terminal in the corresponding IPv6 network in the session mapping table;
The SIP gateway also is used for the port numbers according to the response message of initiation session or the acknowledge message SIP voice terminal in session mapping table record IPv6 network, and sets up mapping relations between described " receiving the IPv6 address and the port numbers of VoP " and " port numbers of the IPv4 interface IP address of IPv6 network gateway and reception VoP " according to the session mapping table;
The SIP gateway is searched the pairing IPv6 of SIP voice terminal user name address in the IPv6 network according to described session mapping table.
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| CN2007101952789A CN101184065B (en) | 2007-12-05 | 2007-12-05 | Method and equipment for implementing voice communication between IPv6 and IPv4 network terminal |
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| CN1463130A (en) * | 2002-05-29 | 2003-12-24 | 三星电子株式会社 | Method and appts, for communicating data between IPv4 and IPv6 |
| CN1674565A (en) * | 2005-05-10 | 2005-09-28 | 中国科学院计算技术研究所 | Method for applying layer gateway used for network address conversion and in protocol translation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1463130A (en) * | 2002-05-29 | 2003-12-24 | 三星电子株式会社 | Method and appts, for communicating data between IPv4 and IPv6 |
| CN1674565A (en) * | 2005-05-10 | 2005-09-28 | 中国科学院计算技术研究所 | Method for applying layer gateway used for network address conversion and in protocol translation |
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| 张越峰,唐学文,张志军.IPv4与IPv6混合网络中的SIP电话通信的研究.计算机技术与发展17 5.2007,17(5),第85页左栏第11行-右栏第40行，第86页右栏第22行-30行. |
| 张越峰,唐学文,张志军.IPv4与IPv6混合网络中的SIP电话通信的研究.计算机技术与发展17 5.2007,17(5),第85页左栏第11行-右栏第40行,第86页右栏第22行-30行. * |
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