CN106506711A - The method and device that the NAT of sip message is passed through in Genesys environment - Google Patents
The method and device that the NAT of sip message is passed through in Genesys environment Download PDFInfo
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- CN106506711A CN106506711A CN201510557417.2A CN201510557417A CN106506711A CN 106506711 A CN106506711 A CN 106506711A CN 201510557417 A CN201510557417 A CN 201510557417A CN 106506711 A CN106506711 A CN 106506711A
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- nat
- sip
- sip message
- request
- message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/256—NAT traversal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
- H04L65/1104—Session initiation protocol [SIP]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Business, Economics & Management (AREA)
- General Business, Economics & Management (AREA)
- Multimedia (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention provides the method and device that a kind of NAT of sip message in Genesys environment is passed through, and the special certification without the need for Genesys can achieve the NAT of sip message and pass through, and can make full use of the task performance of Genesys, save cost.The method that the NAT of sip message is passed through in the Genesys environment of the present invention includes：It is responsible for, in loading sip proxy server, the module that the NAT of sip message is passed through；Parameter setting is carried out to the module；Forward the sip message request through the parameter setting.
Description
Technical field
The present invention relates to technical field of the computer network, a kind of particularly Genesys environment
The method and device that the NAT of middle sip message is passed through.
Background technology
With the development of computer networking technology, the internal network of the private address of some enterprises,
Can be by means of NAT (Network Address Translation, network address translation), logical
When crossing router transmission packet, private address is converted into legal public network IP address.So,
One LAN need to only use a small amount of public network address to can achieve all calculating in private address network
Machine and the communication requirement of Internet, while private network internal host can also be hidden, protect Intranet peace
Entirely.
NAT will be changed automatically when private address can be converted into legal public network IP address
The source IP address of IP messages and purpose IP address, IP Address Velocity is then in NAT processing procedures
It is automatically performed.Source IP address is embedded in the data division of IP messages by some application programs, institute
To also need to while the data division to message is modified, with modified mistake in Match IP head
Source IP address.Otherwise, the application program for being partially submerged into IP address in message data cannot be just
Often work.This process is referred to as NAT and passes through.
VoIP (Voice over Internet Protocol) is exactly by analogue signal in brief
(Voice) digitized, in IP network (IP in the form of data packet (Data Packet)
Network transmission in real time is done on).The VOIP communication products of main flow are made using Session Initiation Protocol mostly
Session management for transmitting audio data bag.SIP (Session Initiation Protocol, session
Initiation protocol) it is that (Internet Engineering Task Force, the Internet engineering appoint by IETF
Business group) multimedia communication protocol formulated.SIP with HTTP similar and employ the latter some
Design principle：Message is text based, and is also the flow process for taking request-response, is used for
Create, change and discharge the session of one or more participants.But from unlike HTTP：
SIP generally uses UDP, and the address information of source is embedded in protocol massages.
VoIP is mainly characterized by low cost；The conjunction of data, voice and video on consolidated network
Into；New demand servicing on centralized network and the simplification management to terminal use etc..These are special
Point causes VoIP to become the mainstream technology of current construction call center system.But due in enterprise
The presence of NAT in net, if seat terminal and telephony gateway, sip server are deployed in not
After with NAT device, then the SIP phones of seat cannot normal work, cause to call
The seat at center can only concentrate deployment, or pass through VPN (virtual private network) VPN, session border control
Device SBC processed is carrying out distal end deployment.
8.1 version of Genesys sip servers is not supported directly to dispose after NAT/ firewall boxs
Seat, the deployment of long-range seat need to be realized by VPN or SBC.
The major function of VPN (virtual private network) VPN is in common network to set up dedicated network, enters
Row encryption communication.VPN when the NAT for carrying out sip message is passed through, the scheme for being adopted be around
NAT/ firewall boxs are crossed, virtual intranet environment is set up, so as to realize that NAT is passed through.
Session Border Controller SBC, is VoIP access layer equipments, and it passes through on the border of network
Place is controlled to realize NAT/ Firewall Traversing functions to session, while bandwidth can also be carried out
Restriction, session management, traffic statistics etc..Secondly, SBC can also be counted as supporting VoIP's
Proxy server, can recognize the message of layer 5 and layer 7, and also can process the 5th
Numerous session signaling agreements more than layer, change the address of data packet head, so as to realize in SBC
Outer net address mapping.
The NAT/ Firewall Traversing processes of SBC follow certain traffic model, in a model can be by
Some channels are resolved in session.In channel aspect, by being set up to channel, being safeguarded and deleted
Except the availability for waiting operation to ensure channel, in session aspect, different channels are attached and are released
The operation such as put, it is possible to achieve whole session penetrates process.
But, specific VPN is depended on based on the NAT/ Firewall Traversings of VPN or SBC
Or SBC servers and related software, and the certification through Genesys manufacturers is needed to support.
And the scheme such as STUN, TURN, ICE, uPnP of existing solution SIP passing through NAT,
The configuration of existing NAT/ fire walls will be not usually changed, SIP phones or SIP is exactly needed
The support of Server, often cost is than larger.
Find in use, NAT/ fire walls are mainly manifested in for the blocking of SIP：SIP
Source IP address in agreement Via and Contact header field:Port to when via NAT device not by
Conversion, causes response message or the subsequent request cannot correct route.Therefore, how to solve
Problem is stated, is the key point of the present invention.
Content of the invention
In view of this, in a kind of Genesys environment of present invention offer, the NAT of sip message is passed through
Method and device, without the need for Genesys special certification i.e. can achieve sip message NAT wear
More, the task performance of Genesys can be made full use of, cost is saved.
For achieving the above object, according to an aspect of the invention, there is provided a kind of Genesys
The method that the NAT of sip message is passed through in environment.
A kind of method that the NAT of sip message is passed through in Genesys environment, including：Loading SIP
It is responsible for the module that the NAT of sip message is passed through in proxy server；Line parameter is entered to the module
Arrange, the parameter setting include to all sip messages request Via header field add rport and
Received parameters；And the sip message request that changes through NAT is modified, described
The request if modification includes the sip message is registration message, adds in its Contact header field
Received parameters, and preserve IP, port and the agreement in the registration message source；Otherwise, weight
The Contact header field is write, by the IP in sip message source, port write Contact heads
Domain；Forward the sip message request through the parameter setting.
Alternatively, the sip proxy server is OpenSIPS or Kamailio.
Alternatively, the module is NatHelper modules.
Alternatively, also include：The sip message request that changes without NAT is directly forwarded.
According to a further aspect in the invention, there is provided sip message in a kind of Genesys environment
The device that NAT is passed through.
The device that the NAT of sip message is passed through in a kind of Genesys environment includes：Module loading
Unit, for loading the module for being responsible in sip proxy server that the NAT of sip message is passed through；
Parameter set unit, for carrying out parameter setting to the module, it is right that the parameter setting includes
All sip message requests add rport and received parameters in Via header field；And to passing through
The sip message request of NAT conversions is modified, if the modification includes the sip message
Request is registration message, adds received parameters in its Contact header field, and preserves the note
The IP of volume informed source, port and agreement；Otherwise, the Contact header field is rewritten, will be described
The IP in sip message source, port write Contact header field；Request retransmission unit, for forwarding
The sip message request through the parameter setting.
Alternatively, the sip proxy server is OpenSIPS or Kamailio.
Alternatively, the module is NatHelper modules.
Alternatively, the request retransmission unit is additionally operable to：The SIP changed without NAT is disappeared
Breath request is directly forwarded.
Technology according to the present invention scheme, by entering SIP request via sip proxy server
Row is forwarded, and is transformed to change through NAT by the Message Source Address in SIP messages before forwarding
The source address of NAT server-assignments and source port afterwards, while preserve source address and NAT ground
The method of the mapping relations of location, enables amended sip message to realize that NAT is passed through, and
The backward signaling that destination party sends also can be correctly sent to by the address mapping relation for preserving before
Message source side after NAT device.The present invention can achieve SIP without the need for the special certification of Genesys
The NAT of message is passed through, and takes full advantage of the task performance of Genesys, so as to save cost.
Description of the drawings
Accompanying drawing does not constitute inappropriate limitation of the present invention for more fully understanding the present invention.Wherein：
Fig. 1 is that the NAT of sip message in Genesys environment according to embodiments of the present invention is passed through
Method key step schematic diagram；
Fig. 2 is that the NAT of sip message in Genesys environment according to embodiments of the present invention is passed through
Method flow diagram；
Fig. 3 is that the NAT of sip message in Genesys environment according to embodiments of the present invention is passed through
Method realize process schematic；
Fig. 4 is that the NAT of sip message in Genesys environment according to embodiments of the present invention is passed through
Device main modular schematic diagram.
Specific embodiment
The one exemplary embodiment of the present invention is explained below in conjunction with accompanying drawing, including this
They should be thought only exemplary to help understanding by the various details of bright embodiment.
Therefore, it will be appreciated by those of ordinary skill in the art that, the embodiments described herein can be done
Go out various changes and modifications, without departing from scope and spirit of the present invention.Equally, in order to clear
Chu eliminates the description to known function and structure with concisely in description below.
Choose ripe sip proxy server of increasing income to disappear carrying out SIP in embodiments of the invention
The forwarding of breath request, sip proxy server is except providing basic sip agent and SIP route work(
Can be outer, additionally provide the function of some application layers, can by the modification to its configuration file,
Realize that the NAT of sip message in Genesys environment is passed through.
Fig. 1 is that the NAT of sip message in Genesys environment according to embodiments of the present invention is passed through
Method key step schematic diagram.As shown in figure 1, SIP in the Genesys environment of the present invention
The method that the NAT of message is passed through mainly includes steps S11 to step S13.
Step S11：It is responsible for, in loading sip proxy server, the mould that the NAT of sip message is passed through
Block.Wherein, the sip proxy server is OpenSIPS or Kamailio.Of the invention real
Applying selection OpenSIPS in example carries out the forwarding of sip message request, can be based on current 1.11.3
Version deploying SIP agency service.Afterwards, by by repairing to its configuration file opensips.cfg
Change, realize that the NAT of sip message in Genesys environment is passed through.Mould described in step S11
Block is NatHelper modules.In OpenSIPS or Kamailio, configuration file is carried out
Modification is carried out by loading NatHelper modules.
Step S12：Parameter setting is carried out to the module.The parameter setting includes：To institute
There is sip message request to add rport and received parameters in Via header field；And to through NAT
The sip message request of conversion is modified, and wherein, the modification includes：If the SIP
Message request is registration message, adds received parameters in its Contact header field, and preserves institute
State IP, port and the agreement in registration message source；Otherwise, the Contact header field is rewritten, will
The IP in the sip message source, port write Contact header field.
Wherein, all sip message requests can be determined according to the particular content of Session Initiation Protocol, for example
Call request INVITE, response message ACK etc., can realize VoIP's by Session Initiation Protocol
Call- Control1.
Carrying out parameter setting in step S12 may include two parts, and a part is in Via header field
Carry out, another part is carried out in Contact header field.Via header field indicates request institute so far
The path that walks, it prevent the circulation of request, while ensure that response (answer) along same
Path returns.Contact header field is may alternatively appear in INVITE, ACK and Register request,
Generally, it provides a URL, and user can further be communicated by this URL.
For INVITE and ACK requests, Contact header field shows to ask to initiate from which position,
This permission calling party directly sends following request, such as BYE to callee, rather than passes through one
The agency of series.Address due to being wanted is probably the address that acts on behalf of, so only in Via heads
Domain carries out parameter setting simultaneously not enough.
Technology according to the present invention scheme, adds rport to the request of all sip messages in Via header field
With received parameters.Wherein, the value of rport parameters is the port of informed source, and received joins
Several values is the IP address of informed source, if having carried out address conversion through NAT device,
Then the value of rport parameters is the port after changing, and the value of received parameters is after changing
IP address.
Afterwards, the sip message request to changing through NAT in Contact header field is repaiied
Change, if sip message request is Register methods, i.e.,：Registration message, then at which
Contact header field adds received parameters, and preserves the IP in the registration message source, port
And the information such as agreement；Otherwise, if sip message request is not registration message, rewrite
The Contact header field, the IP that the sip message is originated, port write Contact header field,
Which is made to include the IP in sip message request source：Port pair.
By above-mentioned parameter configuration, you can solve in Session Initiation Protocol Via and Contact header field
Source IP address:Port to not being transformed when via NAT device, cause response message or after
Continuous request cannot correct route problem, therefore can just realize that NAT wears with the sip message for postponing
More.
Step S13：Forward the sip message request through the parameter setting.To passing through
The sip message of oneself, sip message proxy server OpenSIPS can be from Contact header field
The information such as source, the destination of message are extracted, message can be forwarded accordingly.Special
Ground, for the sip message request that changes without NAT directly will be forwarded.
According to above-mentioned step S11 to step S13, you can realize in Genesys environment to SIP
The NAT of message is passed through.If the RTP proxy modules of loading OpenSIPS carry out parameter setting,
The NAT that also can achieve RTP is passed through.NAT/ firewall box deployment seats pass through
OpenSIPS is accomplished to the registration of Genesys sip servers, you can be normally carried out conversing.
Fig. 2 is that the NAT of sip message in Genesys environment according to embodiments of the present invention is passed through
Method flow diagram.As shown in Fig. 2 when OpenSIPS receives sip message request (step
S21, after), to all requests, first, rport and received parameters (step is inserted in Via header field
Rapid S22), then, then the request that changes through NAT is modified.By judging to ask
From after NAT, whether send (step S23) determine whether the request have passed through NAT conversions.
If have passed through NAT conversions, sip message request is modified, is specifically included：Judge
Whether the request is registration message (step S24), if registration message, then in Contact heads
Domain adds received parameters, and preserves the IP of informed source, port, agreement (step S25)
Etc. parameter；Otherwise, for other message requests of non-register messages, then Contact header field is rewritten,
By the IP of informed source, port write Contact header field (step S26), so that Contact
IP of the header field comprising the information request source:Port pair.After the completion of to sip message request modification,
Forward message (step S27).For change without NAT sip message request, then without
Need to modify, directly forward message (step S27).
Fig. 3 is that the NAT of sip message in Genesys environment according to embodiments of the present invention is passed through
Method realize process schematic.Such as Fig. 3, it is the NAT of a Register registration message
Crossing process, as indicated by the dextrosinistral arrow of upper row, for the process that SIP phones send
The sip message request of NAT/ fire walls, after OpenSIPS, to which are added " rport "
The value " 2049 " of parameter, increased " received " parameter and its value " received=10.13.10.65 ",
To preserve IP, port and the agreement of informed source.Afterwards, the sip message request is transmitted to
Sip server Genesys SIP Server 8.1 are processed.Following row arrow institute from left to right
Show, when there is response message, sip server can according to preserve sip message source address and
The mapping relations of NAT addresses, response message is correctly sent to the message after NAT/ fire walls
Source side.
Fig. 4 is that the NAT of sip message in Genesys environment according to embodiments of the present invention is passed through
Device main modular schematic diagram.As shown in figure 4, SIP in the Genesys environment of the present invention
The device 40 that the NAT of message is passed through mainly includes module loading unit 41, parameter set unit
42 and request retransmission unit 43.
Module loading unit 41 is used for loading the NAT for being responsible for sip message in sip proxy server
The module that passes through；Parameter set unit 42 is used for carrying out the module parameter setting, the ginseng
Number setting includes：Rport and received ginsengs are added in Via header field to the request of all sip messages
Number；And the sip message request that changes through NAT is modified, the modification includes：
If the sip message request is registration message, received ginsengs are added in its Contact header field
Number, and preserve IP, port and the agreement in the registration message source；Otherwise, the Contact is rewritten
Header field, the IP that the sip message is originated, port write Contact header field；Request forwards single
Unit 43 is used for forwarding the sip message request through the parameter setting.
Embodiments in accordance with the present invention, the sip proxy server be OpenSIPS or
Kamailio, and the module is NatHelper modules.
According to the function of required realization, request retransmission unit 43 can be also used for without
The sip message request of NAT conversions is directly forwarded.
Technical scheme according to embodiments of the present invention, by taking SIP request via sip agent
Business device is forwarded, and before forwarding the Message Source Address in SIP messages is transformed to through NAT
The source address of NAT server-assignments and source port after conversion, while preserve source address and NAT
The method of the mapping relations of address, enables amended sip message to realize that NAT is passed through, and
And the backward signaling that sends of destination party also can be correctly transmitted by the address mapping relation for preserving before
To the message source side after NAT device.The present invention is can achieve without the need for the special certification of Genesys
The NAT of sip message is passed through, and takes full advantage of the task performance of Genesys, so as to save
Cost.
Above-mentioned specific embodiment, does not constitute limiting the scope of the invention.This area
Technical staff is it is to be understood that depending on design requirement and other factors, can occur various
The modification of various kinds, combination, sub-portfolio and replacement.Any within the spirit and principles in the present invention
Modification, equivalent and improvement for being made etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of method that the NAT of sip message is passed through in Genesys environment, it is characterised in that
Including：
It is responsible for, in loading sip proxy server, the module that the NAT of sip message is passed through；
Parameter setting is carried out to the module, and the parameter setting includes：
Rport and received parameters are added in Via header field to the request of all sip messages；And
The sip message request that changes through NAT is modified, the modification includes：
If the sip message request is registration message, received is added in its Contact header field
Parameter, and preserve IP, port and the agreement in the registration message source；
Otherwise, the Contact header field, the IP that the sip message is originated, port write are rewritten
Enter Contact header field；
Forward the sip message request through the parameter setting.
2. method according to claim 1, it is characterised in that the sip agent service
Device is OpenSIPS or Kamailio.
3. method according to claim 1 and 2, it is characterised in that the module is
NatHelper modules.
4. method according to claim 1, it is characterised in that also include：
The sip message request that changes without NAT is directly forwarded.
5. the device that the NAT of sip message is passed through in a kind of Genesys environment, it is characterised in that
Including：
Module loading unit, for loading the NAT for being responsible for sip message in sip proxy server
The module that passes through；
Parameter set unit, for carrying out parameter setting, the parameter setting bag to the module
Include：
Rport and received parameters are added in Via header field to the request of all sip messages；And
The sip message request that changes through NAT is modified, the modification includes：
If the sip message request is registration message, received is added in its Contact header field
Parameter, and preserve IP, port and the agreement in the registration message source；
Otherwise, the Contact header field, the IP that the sip message is originated, port write are rewritten
Enter Contact header field；
Request retransmission unit, for forwarding the sip message request through the parameter setting.
6. device according to claim 5, it is characterised in that the sip agent service
Device is OpenSIPS or Kamailio.
7. the device according to claim 5 or 6, it is characterised in that the module is
NatHelper modules.
8. device according to claim 5, it is characterised in that the request retransmission unit
It is additionally operable to：
The sip message request that changes without NAT is directly forwarded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510557417.2A CN106506711A (en) | 2015-09-06 | 2015-09-06 | The method and device that the NAT of sip message is passed through in Genesys environment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510557417.2A CN106506711A (en) | 2015-09-06 | 2015-09-06 | The method and device that the NAT of sip message is passed through in Genesys environment |
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| CN106506711A true CN106506711A (en) | 2017-03-15 |
Family
ID=58287667
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| CN201510557417.2A Pending CN106506711A (en) | 2015-09-06 | 2015-09-06 | The method and device that the NAT of sip message is passed through in Genesys environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541691A (en) * | 2020-04-22 | 2020-08-14 | 北京盛德远景科技有限公司 | SIP call boundary control system based on SIP call |
| CN113099056A (en) * | 2021-03-24 | 2021-07-09 | 网经科技（苏州）有限公司 | Method for realizing NAT traversal of VoIP based on kamailio |
-
2015
- 2015-09-06 CN CN201510557417.2A patent/CN106506711A/en active Pending
Non-Patent Citations (1)
| Title |
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| 走南闯北: "使用OpenSIPS构建电话通信系统-9SIP穿越NAT", 《豆丁网》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541691A (en) * | 2020-04-22 | 2020-08-14 | 北京盛德远景科技有限公司 | SIP call boundary control system based on SIP call |
| CN111541691B (en) * | 2020-04-22 | 2022-04-01 | 北京盛德远景科技有限公司 | SIP call boundary control system based on SIP call |
| CN113099056A (en) * | 2021-03-24 | 2021-07-09 | 网经科技（苏州）有限公司 | Method for realizing NAT traversal of VoIP based on kamailio |
| CN113099056B (en) * | 2021-03-24 | 2022-07-22 | 网经科技（苏州）有限公司 | NAT (network Address translation) traversing method for realizing VoIP (Voice over Internet protocol) based on kamailio |
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Application publication date: 20170315 |