CN103188156A - VOIP call routing device and method based on user datagram protocol (UDP) multicast - Google Patents
VOIP call routing device and method based on user datagram protocol (UDP) multicast Download PDFInfo
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Abstract
The invention discloses a VOIP call routing device and method based on user datagram protocol (UDP) multicast. The VOIP call routing device is arranged in a VOIP terminal and comprises a call routing customer module and a call routing service module. A call routing table is further stored in the VOIP call routing device. The call routing customer module sends call routing datagram to a subnet. Call routing service modules of other terminals in the same multicast group receive the call routing datagram, and update call routing tables stored by the call routing service modules of the other terminals according to the call routing datagram. When a terminal dials a number, the call routing table is sought for according to the number so that an IP address and a port number of a called terminal are obtained, and a call is started to the called terminal according to a seeking result. By means of the VOIP call routing device and method based on UDP multicast, communication between terminals can be achieved without arranging other servers in a network, so that the network structure is simplified and cost is saved. The VOIP call routing device and method based on UDP multicast is easy to maintain in a later stage and particularly suitable for a miniature network system.
Description
Technical field
The present invention relates to a kind of VOIP based on the UDP multicast and call out route device and method, belong to the UDP technical field of multicast.
Background technology
For large-scale VOIP network system, in order to realize calling out route, usually need being used of multiple server, for example in Session Initiation Protocol, comprise acting server (Proxy Server), Redirect Server (Redirected Server), registrar (Registrar) and location-server etc.Wherein acting server is most important network functional entity in the SIP IP telephony system, and routing function mainly is provided, and is responsible for user's SIP request and response are forwarded to next jumping, finally arrives the destination; Registrar is to finish the logic entity that the user agent registered/nullified function, and it receives the registration request of the user agent in its compass of competency, and user agent's address information is added in the location-server; Redirect Server is the logic entity of realizing call redirect functions, it receives the call request of user agent client UAC, by configured strategy in the server and destination that the inquiry of location-server indication UAC is redirected to other with calling, to realize the flexible control to calling out; Location-server is the functional entity outside the Session Initiation Protocol category, its in store user's logical address and the binding information between current contact address, support is to inquiry, interpolation, modification and the deletion of address binding information, for registrar, acting server and Redirect Server provide service.These servers have played very important effect in big-and-middle-sized network system.
For some small-sized VOIP networks, the user often wishes to reduce number of servers to simplify network configuration, in the network system of simplifying, should guarantee basic speech business and call out route, can reduce expenditure again and reduce operation maintenance cost.
The IP agreement in order to add the support to multicast, has produced IGMP (Internet GroupManagement Protocol) agreement after occurring.IGMP notifies router, in the subnet at this router place, after the data of certain multicast group arrive, if there is the user interested in the data that send to this multicast group, router just can not abandon these data, but these data are transmitted to all users interest.If party A-subscriber and party B-subscriber in the different sub-network will carry out cast communication, so, routers all between party A-subscriber and the party B-subscriber must all will be supported the IGMP agreement, otherwise can not communicate between party A-subscriber and the party B-subscriber.
Utilize the UDP multicast can be at Intarnet, the multicast that the last form with datagram of Internet is carried out data (carries out multicast at internet, require router to support IGMP). with respect to the broadcasting (broadcasting can only be broadcasted in intranet) of extreme consume network bandwidth, the UDP multicast has had very big optimization, have only terminal to join a multicast group, the data of UDP multicast could be received by other-end in the multicast group.
Summary of the invention
In view of the foregoing, the object of the present invention is to provide a kind of UDP of utilization multicast mode to realize calling out the apparatus and method of route, as long as the VOIP terminal in the network is supported calling route device of the present invention and method, just need not in the network call function that other servers can be realized each terminal is set, be specially adapted in the small-sized VOIP network system.
For achieving the above object, the present invention is by the following technical solutions:
A kind of VOIP calls out route device, is arranged in the some VOIP terminals in the same multicast group, and this device comprises:
Call out the routed customer module and call out the route service module, call out the routed customer module and send the call routing data newspaper to described VOIP terminal place subnet, receive this call routing data newspaper with the calling route service module of other VOIP terminals in the multicast group.
Further:
This device stores call routing table, described calling routed customer module sends the call routing data newspaper to described VOIP terminal place subnet, the calling route service module of described other VOIP terminals receives this call routing data newspaper, and upgrades this call routing table of storage separately according to this call routing data newspaper.
The form of described call routing data newspaper is:
0 15 16 31
Wherein, data type field is 1 expression route registration message, is 0 expression cancellation route registration message;
The data field field is deposited call routing information, and this call routing information comprises the number of IP phone, the number segment of the prefix of trunking or IAD equipment.
Described call routing information is divided into two types, and a kind of is p for identification number or number segment, and another kind is the P for the sign prefix types, number and prefix support asterisk wildcard X coupling and interval sign-.
Based on the VOIP call route method that said apparatus is realized, this method comprises:
1) during described VOIP starting terminal or end message send described call routing data newspaper by described calling routed customer module to this terminal place subnet when changing;
2) the calling route service module of other VOIP terminals receives this call routing data newspaper, upgrades the described call routing table of storage separately, these other VOIP terminals and 1) described in the VOIP terminal belong to same multicast group.
Further:
The calling routed customer module of described VOIP terminal is called out the route cycle register every one and is sent described call routing data newspaper to described other VOIP terminals, and this calling route cycle register is a time interval.
If surpass described calling route cycle register, the described calling route service module of described other VOIP terminals is not received the described call routing data newspaper that described VOIP terminal sends, described other VOIP terminals are upgraded the described call routing table of its storage, the clauses and subclauses of corresponding described VOIP terminal in the deletion call routing table.
If described VOIP terminal modifications the configuration or desire to withdraw from multicast group, just in this multicast group, send cancellation route registration message, after described other VOIP terminals are received this cancellation route registration message, upgrade the described call routing table of its storage, delete the clauses and subclauses of corresponding described VOIP terminal in the call routing table, this cancellation route registration message is that data type field is 0 described call routing data newspaper.
When described VOIP terminal is dialed called number, search described call routing table according to this called number, to obtain IP address and the port numbers of terminal called, make a call to this terminal called according to this IP address and port numbers then.
If described VOIP terminal is only supported the calling of single agreement, then receive the described call routing data that carries other protocol types that described other-end sends when described VOIP terminal and give the correct time, abandon described call routing data newspaper.
If described VOIP terminal has received the described call routing data newspaper that carries duplicate numbers that described other VOIP terminals send, then during described VOIP terminal call, Priority Call and described VOIP terminal are positioned at the terminal of same subnet; If duplicate numbers is from same subnet, described VOIP terminal any one terminal in the selective call duplicate numbers in described call routing table then;
When described VOIP terminal is searched described call routing table according to called number, find that this called number has mated number and two clauses and subclauses of prefix simultaneously, then described VOIP terminal Priority Call numbers match item.
The invention has the advantages that:
VOIP of the present invention is set in terminal calls out route device, and utilize VOIP call route method of the present invention can realize the call function of each terminal in the network, like this, need not to dispose again other servers in the network, simplified network configuration, be easy to later maintenance, saved cost, be specially adapted in the network system of small-sized enterprises and institutions.
Description of drawings
Fig. 1 is the structural representation that VOIP of the present invention calls out route device;
Fig. 2 is the flow chart of VOIP call route method of the present invention;
Fig. 3 is a specific embodiment schematic diagram of the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with drawings and Examples.
Fig. 1 is the structural representation that VOIP of the present invention calls out route device.As shown in the figure, the VOIP calling route device 10 of the present invention that is arranged in the VOIP terminal comprises calling routed customer module 20 and calls out route service module 30 that device also stores call routing table 40.The calling routed customer module 20 of VOIP terminal sends the call routing data newspaper to this VOIP terminal place subnet, the calling route service module 30 of other VOIP terminals (belonging to the terminal of same multicast group with this VOIP terminal) receives this call routing data newspaper, upgrades its stored calls routing table 40 separately according to this call routing data newspaper.The form of call routing data newspaper is as follows:
0 15 16 31
Wherein:
4 versions: the version of call routing data newspaper, if 1.0 versions, then this field is 1;
Data type: the type of identifying call letters route data newspaper, 1 is the route registration message, 0 is cancellation route registration message;
Protocol type: according to the VOIP protocol type, definition 1 is Session Initiation Protocol, and 2 is the H323 agreement, and 3 is the IAX agreement, and 4 is the MGCP agreement, Extended Protocol type as required in the practical application;
Device type: be divided into according to the equipment that adds the multicast call route:
1 is the IP phone, and 2 is the TG trunking, and 3 is MG3000-A (R) equipment (no FXO mouth), and 4 are MG3000-A (R) equipment (the FXO mouth is arranged);
The head length degree: the head length degree of call routing data newspaper, minimum value is 16, is unit with the byte, can expand;
The FXO number: when equipment is when having the VOIP equipment of FXO mouth, identify the number of FXO mouth, if trunking or equipment do not have the FXO mouth, then this field is 0;
The FXS number: when equipment is when having the VOIP equipment of FXS mouth, identify the number of FXS mouth, if trunking, then this field is 0;
16 bit check positions: only to the data header carry out verification and, verification is not carried out in the data field, verification and computational methods be: at first this 16 bit check bit field is set to 0, then each 16bit in the data header is carried out complement of one's summation, and the result is left in this 16 bit check bit field;
Device IP: the IP address of VOIP terminal, this IP address can be the IP addresses on the IPv4 basis, also can expand to the IP address on the IPv6 basis;
Protocol layer corresponding port number in the equipment PORT:VOIP terminal, for example: the Session Initiation Protocol default port is that 5060, H323 agreement default port is 1720 etc.
16 total lengths: the total length of call routing data newspaper is unit with the byte;
Reserved place: use for expansion;
Data field: deposit call routing information, the number of IP phone for example, the number segment of the prefix of trunking or IAD equipment etc.;
The form that call routing information is deposited in the data field is: based on text mode, use the UTF-8 character set; Define two types at present: for the p of identification number or number segment with for the P that identifies prefix types, wherein, number and prefix support asterisk wildcard X to mate and the interval identifies-.
For example: p=1000,2000,3000-5000,6X20 represent that terminal can support that number is all numbers and finish and second access that number can be the number of Any Digit with 6 beginnings 20 between 1000,2000,3000 to 5000.Again for example: P=2,3,6 expression trunkings can support prefix be 2,3 and the number of 6 three kind of prefix insert.
If terminal is supported the call routing information of two types of p and P, then separate with " r n " between these two types of data, the data field field equally with " r n " as end mark.
Each field of above call routing data newspaper all can be expanded according to actual needs, is not restricted to the above-mentioned content of mentioning in the specific embodiment of lifting.
Fig. 2 is the flow chart of VOIP call route method of the present invention.As shown in the figure, method of the present invention is specially:
During the 50:VOIP starting terminal or end message when changing by calling out the routed customer module to place subnet issue call routing data newspaper;
After being provided with the VOIP starting terminal that VOIP of the present invention calls out route device, desire adds one and calls out the routing multicast group, will send an IGMP to the all-router of self place subnet and join request; Router also can timing send a query messages to all terminals in the subnet, whether be used for inquiry also has terminal interested in the call routing data of certain multicast group, if any, interested terminal will be responded an IGMP message to router, and router then continues to transmit the data of this multicast group to this terminal; If there is not terminal to respond, router just thinks that not had terminal interested in the call routing data of this multicast group, follow-uply no longer the call routing data of this multicast group is transmitted.After terminal successfully adds multicast group, just can report to other VOIP terminals transmission call routing datas of same multicast group by calling out the routed customer module.
60: the calling route service module of other VOIP terminals receives this call routing data newspaper, upgrade stored calls routing table separately, VOIP terminal in these other VOIP terminals and the step 50 belongs to same multicast group, and this call routing table comprises fields such as number/prefix, IP address, port numbers, protocol type, device type.
The scope of multichannel multicast address arrives between " 239.255.255.255 " at " 224.0.0.0 ", choosing " 224.224.224.224 " identifies as a multicast group address, when terminal A desire adds " 224.224.224.224 " multicast group, just the all-router transmission IGMP to the place subnet joins request, after success adds this multicast group, terminal A namely becomes a member of this multicast group, the follow-up call routing data newspaper that just can receive other-end transmission in this multicast group, the calling route service module of terminal A will be by asynchronous receive mode receipt of call route data newspaper, and the data that receive are used by the event notice upper level handle, upgrade its stored calls routing table according to the call routing data newspaper that receives simultaneously.
The calling routed customer module of terminal A is used for sending the call routing data newspaper of this machine, be about to the call routing data newspaper and send in the multicast group " 224.224.224.224 ", can receive the call routing data newspaper of terminal A transmission with the other-end of multicast group by calling route service module separately.It should be noted that, the call routing data newspaper of terminal A needs timed sending, set one and call out the route cycle register, namely send the time interval of call routing data newspaper, such as 300 seconds, call out the route cycle register if surpass this, do not receive the route registration message (data type field that is the call routing data newspaper is 1) of terminal A or in calling out the route cycle register, received cancellation route registration message (data type field that is the call routing data newspaper is 0) with the other-end of multicast group, then other-end upgrades stored calls routing table separately, deletes in the call routing table clauses and subclauses about terminal A.
Call out the routed customer module and on software is realized, all use socket model with calling route service module.When using the UDP socket, local socket is bundled on the multicast address, calls out the route service module and monitor a port in this locality, such as 65432.During binding (bind) multicast address, be the multicast address of this binding owing to only set receiver address, and can not set the transmission source IP address, so, must use the IP_MULTICAST_IF interface to specify a transmission interface, this transmission interface can be an IP address of terminal.Like this, just can realize calling out the routed customer module and send the call routing data newspaper to this multicast address, call out the route service module simultaneously and can receive the call routing data newspaper that this multicast address mails to listening port 65432.In addition, also can increase the IP_ADD_MEMBERSHIP option operations so that a socket is joined a multicast group.
Fig. 3 is a specific embodiment schematic diagram of the present invention.As shown in the figure, after starting, terminal 1 added multicast group " 224.224.224.224 ", can be that source IP address sends this machine call routing data newspaper with 192.216.18.4 by calling out the routed customer module, can receive the call routing data newspaper that sends with other-end in the multicast group by calling out the route service module simultaneously, the call routing data that the calling routed customer module of terminal 1 sends reports concrete form to be:
0 15 16 31
If terminal 2, terminal 3, terminal 4, terminal 5 and terminal 6 have added " 224.224.224.224 " multicast group equally, then but the call routing data of the calling route service module receiving terminal 2 of terminal 1, terminal 3, terminal 4, terminal 5 and terminal 6 transmissions is reported, and report more new terminal 1 stored calls routing table according to the call routing data that above-mentioned each terminal sends, the concrete form of call routing table is as follows in this moment terminal 1:
| Number/prefix | The IP address | Port numbers | Protocol | Device type | |
| 1006 | 192.216.18.2 | 5060 | SIP | The |
|
| 1007 | 192.216.18.3 | 5060 | SIP | The |
|
| 2000 | 192.216.224.4 | 8060 | SIP | The |
|
| 2001 | 192.216.224.2 | 5060 | SIP | MG3000-A(R) | |
| 2002 | 192.216.224.2 | 5060 | SIP | MG3000-A(R) | |
| 2003 | 192.216.224.2 | 5060 | SIP | MG3000-A(R) | |
| 2004 | 192.216.224.2 | 5060 | SIP | MG3000-A(R) | |
| 2005 | 192.216.224.3 | 5060 | SIP | The IP phone |
Be example with terminal 5, because carried following information in the call data newspaper that terminal 5 sends: device type is 3, and protocol type is 1, and Device IP is 192.216.224.2, device port is 5060, data type is p=2001-2004, so the clauses and subclauses of counterpart terminal 5 are in the terminal 1 stored calls routing table: the IP address is 192.216.224.2, and port numbers is 5060, agreement is SIP, device type is MG3000-A (R), and number is 2001 to 2004, totally four.
Equally, the calling route service module of terminal 4 receives the call routing data that terminal 1, terminal 2, terminal 3, terminal 5 and terminal 6 send and gives the correct time, new terminal 4 stored calls routing tables more, and its form is:
| Number/prefix | The IP address | Port numbers | Protocol | Device type | |
| 1000 | 192.216.18.4 | 6060 | SIP | MG3000-A(R) | |
| 1003 | 192.216.18.4 | 6060 | SIP | MG3000-A(R) | |
| 1004 | 192.216.18.4 | 6060 | SIP | MG3000-A(R) | |
| 1005 | 192.216.18.4 | 6060 | SIP | MG3000-A(R) | |
| 0 (prefix) | 192.216.18.4 | 6060 | SIP | MG3000-A(R) | |
| 1006 | 192.216.18.2 | 5060 | SIP | The |
|
| 1007 | 192.216.18.3 | 5060 | SIP | The |
|
| 2001 | 192.216.224.2 | 5060 | SIP | MG3000-A(R) | |
| 2002 | 192.216.224.2 | 5060 | SIP | MG3000-A(R) | |
| 2003 | 192.216.224.2 | 5060 | SIP | MG3000-A(R) | |
| 2004 | 192.216.224.2 | 5060 | SIP | MG3000-A(R) | |
| 2005 | 192.216.224.3 | 5060 | SIP | The IP phone |
For terminal 1, because carried following information in the call routing data of its transmission newspaper: device type is 3, protocol type is 1, Device IP is 192.216.18.4, device port is 6060, data type is p=1000,1003-1005 and P=0, so the clauses and subclauses of counterpart terminal 1 are in the terminal 4 stored calls routing tables: the IP address is 192.216.18.4, port numbers is 6060, and agreement is SIP, and device type is MG3000-A (R), number be 1000,1003 to 1005 and prefix be 0, totally five.
In like manner, terminal 2, terminal 3, terminal 5 and terminal 6 are safeguarded call routing table separately separately, even being positioned at different subnets, terminal also can realize communication by the router forwarding, and the form of the call routing table of terminal storage is all identical with maintenance mode in the different sub-network, just requires router must support the IGMP agreement.
When certain terminal modifications in the multicast group configuration or when desiring to withdraw from this multicast group, just in this multicast group, send cancellation route registration message, after other-end in this multicast group is received this message, upgrade stored calls routing table separately, delete in the call routing table clauses and subclauses that should terminal; Another situation is, call out the route cycle register if surpass, other-end is not received the route registration message of this terminal, then other-end is deleted in the stored calls routing table separately clauses and subclauses that should terminal, can when arrive calling out the route cycle register, temporarily not delete clauses and subclauses that should terminal yet, but be three times in by the time when calling out the route cycle register, do not delete again in the call routing table clauses and subclauses that should terminal if still receive the route registration message of this terminal.
The stored calls routing table realizes calling out with passing through separately between each terminal in the multicast group.Such as, when terminal 1 is dialed called number 2000, at first search its stored calls routing table, and from this call routing table, find clauses and subclauses that should number:
| 2000 | 192.216.224.4 | 8060 | SIP | The IP phone |
After finding, because the protocol type of supporting is SIP, so flow process according to the Session Initiation Protocol definition, terminal 1 is that the port numbers of 192.216.224.4 is that 8060 terminal 4 makes a call to the IP address, send Invite message to it, thereby realize and the communicating by letter of terminal 4, as if the clauses and subclauses that in call routing table, do not find coupling according to call number or prefix, then call failure.
In calling procedure, below three kinds of situations need special processing:
The first, VOIP terminal is only supported the calling of single agreement, then receives the call routing data that carries other protocol types that sends with other-end in the multicast group when this VOIP terminal and gives the correct time, and abandons this call routing data newspaper; Such as, terminal 1 is only supported Session Initiation Protocol, the protocol type that carries of receiving when terminal 1 that terminal 2 sends is that the call routing data of H323 gives the correct time, and just this call routing data is reported to abandon.
Second, the VOIP terminal has received the call routing data newspaper that carries duplicate numbers that sends with other VOIP terminals in the multicast group, then Priority Call and this VOIP terminal are positioned at the terminal of same subnet during this VOIP terminal call, if and duplicate numbers is from same subnet (Subscriber Number configuration clash), then this VOIP terminal can be in call routing table any one terminal in the selective call duplicate numbers.
When the 3rd, VOIP terminal is searched call routing table according to called number, find that the called number of dialing has mated number and two clauses and subclauses of prefix simultaneously, then this VOIP terminal Priority Call numbers match item.
Above treatment of special situation method is only for illustrating; but not be used for restriction the present invention; under based on the situation of basic thought of the present invention, can carry out corresponding strategy adjustment for any special circumstances that run in the practical application, and all should be within protection scope of the present invention.
The present invention arranges VOIP to call out route device in each VOIP terminal in same multicast group, and utilize the VOIP call route method, send the call routing data newspaper by calling out the routed customer module, the calling route service module of other-end receives this call routing data newspaper, and upgrades stored calls routing table separately according to this call routing data newspaper.During the terminal call number, can make a call to terminal called by Session Initiation Protocol then according to this number searching call routing table to obtain IP address and the port numbers of terminal called.Utilize apparatus and method of the present invention, need not to arrange other servers in the network and can realize communication between terminals, simplified network configuration, saved cost and be easy to later maintenance, be specially adapted in the mininet system.
The above is preferred embodiment of the present invention and the know-why used thereof; for a person skilled in the art; under the situation that does not deviate from the spirit and scope of the present invention; any based on apparent changes such as the equivalent transformation on the technical solution of the present invention basis, simple replacements, all belong within the protection range of the present invention.
Claims (12)
1. the VOIP based on the UDP multicast calls out route device, is arranged in the some VOIP terminals in the same multicast group, it is characterized in that this device comprises:
Call out the routed customer module and call out the route service module, call out the routed customer module and send the call routing data newspaper to described VOIP terminal place subnet, receive this call routing data newspaper with the calling route service module of other VOIP terminals in the multicast group.
2. VOIP as claimed in claim 1 calls out route device, it is characterized in that, it stores call routing table, described calling routed customer module sends the call routing data newspaper to described VOIP terminal place subnet, the calling route service module of described other VOIP terminals receives this call routing data newspaper, and upgrades this call routing table of storage separately according to this call routing data newspaper.
3. VOIP as claimed in claim 2 calls out route device, it is characterized in that, the form of described call routing data newspaper is:
0 15 16 31
Wherein, data type field is 1 expression route registration message, is 0 expression cancellation route registration message;
The data field field is deposited call routing information, and this call routing information comprises the number of IP phone, the number segment of the prefix of trunking or IAD equipment.
4. VOIP as claimed in claim 3 calls out route device, it is characterized in that described call routing information is divided into two types, a kind of is p for identification number or number segment, another kind is the P for the sign prefix types, number and prefix support asterisk wildcard X to mate and the interval identifies-.
5. based on the VOIP call route method of each described device realization in the claim 1 to 4, it is characterized in that this method comprises:
1) during described VOIP starting terminal or end message send described call routing data newspaper by described calling routed customer module to this terminal place subnet when changing;
2) the calling route service module of other VOIP terminals receives this call routing data newspaper, upgrades the described call routing table of storage separately, these other VOIP terminals and 1) described in the VOIP terminal belong to same multicast group.
6. VOIP call route method as claimed in claim 5, it is characterized in that, the calling routed customer module of described VOIP terminal is called out the route cycle register every one and is sent described call routing data newspaper to described other VOIP terminals, and this calling route cycle register is a time interval.
7. VOIP call route method as claimed in claim 6, it is characterized in that, if surpass described calling route cycle register, the described calling route service module of described other VOIP terminals is not received the described call routing data newspaper that described VOIP terminal sends, described other VOIP terminals are upgraded the described call routing table of its storage, the clauses and subclauses of corresponding described VOIP terminal in the deletion call routing table.
8. VOIP call route method as claimed in claim 6, it is characterized in that, if described VOIP terminal modifications the configuration or desire to withdraw from multicast group, just in this multicast group, send cancellation route registration message, after described other VOIP terminals are received this cancellation route registration message, upgrade the described call routing table of its storage, delete the clauses and subclauses of corresponding described VOIP terminal in the call routing table, this cancellation route registration message is that data type field is 0 described call routing data newspaper.
9. VOIP call route method as claimed in claim 6, it is characterized in that, when described VOIP terminal is dialed called number, search described call routing table according to this called number, to obtain IP address and the port numbers of terminal called, make a call to this terminal called according to this IP address and port numbers then.
10. VOIP call route method as claimed in claim 9, it is characterized in that, if described VOIP terminal is only supported the calling of single agreement, then receive the described call routing data that carries other protocol types that described other-end sends when described VOIP terminal and give the correct time, abandon described call routing data newspaper.
11. VOIP call route method as claimed in claim 9, it is characterized in that, if described VOIP terminal has received the described call routing data newspaper that carries duplicate numbers that described other VOIP terminals send, then during described VOIP terminal call, Priority Call and described VOIP terminal are positioned at the terminal of same subnet; If duplicate numbers is from same subnet, described VOIP terminal any one terminal in the selective call duplicate numbers in described call routing table then.
12. VOIP call route method as claimed in claim 9, it is characterized in that, when described VOIP terminal is searched described call routing table according to called number, find that this called number has mated number and two clauses and subclauses of prefix simultaneously, then described VOIP terminal Priority Call numbers match item.
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| CN114449062A (en) * | 2021-12-31 | 2022-05-06 | 广东国腾量子科技有限公司 | Interactive system and method of QKD key management system |
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| CN105323155A (en) * | 2015-11-30 | 2016-02-10 | 用友网络科技股份有限公司 | Method for communication of on-line service system with third party instant messaging system |
| CN112866428A (en) * | 2020-12-31 | 2021-05-28 | 广州芯德通信科技股份有限公司 | IAD device communication method and system |
| CN114449062A (en) * | 2021-12-31 | 2022-05-06 | 广东国腾量子科技有限公司 | Interactive system and method of QKD key management system |
| CN114449062B (en) * | 2021-12-31 | 2023-10-24 | 广东国腾量子科技有限公司 | Interactive system and method of QKD key management system |
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