[OpenSIPS-Devel] Contents of Devel digest multi-domain roamning
Bogdan-Andrei Iancu
bogdan at voice-system.ro
Sat Sep 12 22:49:39 CEST 2009
Hi,
if the request went C1 -> P2 -> P1, the replies will go exactly the same
way (backwards) as the requests.
So for replies, everything should work.
For registering through a proxy (like C1 registering with P1 via P2), in
SIP, there are 2 ways to go:
1) step by step registration: C1 registers with P2 (P2 will have C1
contact) and P2 registers with P1 (P1 will have P2 contact)
2) use PATH support
Regards,
Bogdan
zhangchao00001 wrote:
> Dear sir:
> NAT
> Register: C1--------->P2-------->P1
> case 1: P1 send the Response message directly to C1. Because C1
> dosen't connect with P1 directly, the NAT will block the message, it
> will not reach C1
> case 2: P1 send the response message to P2. Because P2 dosen't have
> C1's address, it will reply "404 Not Found error" message
> In both cases, C2 will not telephone with C1 sucessfully. We suppose
> that C1 must register to P1 through P2
> C1 NAT P2 P1 C2
> | | | | |
> | INVITE | | | |
> |-------->|--------->| | |
> | | |------->| |
> | | | |-------->|
> | | | | |
> C1 dosen't register to P1 directly but through P2, so P1 will not
> reach C1 directly which will be blocked by NAT, it need forward the
> message to P2 firstly. However, P2 dosen't have the C1 address in its
> database, it reply "404 Not Found error" .How to make the phone ?
>
> 在2009-09-11，devel-request at lists.opensips.org <mailto:devel-request at lists.opensips.org> 写道：
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> >Today's Topics:
> >
> > 1. questions about inter-domain roaming (zhangchao00001)
> > 2. Re: questions about inter-domain roaming (Thomas Gelf)
> > 3. Test results for per-branch reply routes (Thomas Gelf)
> >
> >
> >----------------------------------------------------------------------
> >
> >Message: 1
> >Date: Fri, 11 Sep 2009 08:40:26 +0800 (CST)
> >From: zhangchao00001 <zhangchao0000198 at 163.com <mailto:zhangchao0000198 at 163.com>>
> >Subject: [OpenSIPS-Devel] questions about inter-domain roaming
> >To: opensip-devel <devel at lists.opensips.org <mailto:devel at lists.opensips.org>>
> >Message-ID:
> > <23006491.29551252629626844.JavaMail.coremail at app180.163.com <mailto:23006491.29551252629626844.JavaMail.coremail at app180.163.com>>
> >Content-Type: text/plain; charset="gbk"
> >
> >
> >
> >Hello everybody, I have some questions about Inter-domain Roaming.
> >________________________________
> >| |
> >| C1 at DomainA C3 at DomainB |
> >|_______________________________|
> >|_____________NAT_______________|Domain B
> >| |
> >|_____________P2________________|
> > |
> > |
> > |
> > __________|___________
> > | |
> > | P1(S1) |
> > | |
> > | |
> > | C2 at DomainA |
> > |____________________|
> > Domain A
> >Here is my experiment environment(the picture above):there are two Domains A and B, C1?C2 belong to Domain A, C3 to Domain B, P1 and P2 are proxy server. C1 roams in Domain B and register to P1 through P2. then C2 want to make a telephone to C1, C1 and C3 have the private ip address and connect to P2 throught nat(port reserved) device. I want to ask how to write the correct config file to make the call? Because P2 dosen't have the C1 in its location table, when the Invite message come to P2, P2 dosen't know where to send the Invite message. if P1 send the Invite message to C1 directly, the nat device will block it.
> >-------------- next part --------------
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> >
> >------------------------------
> >
> >Message: 2
> >Date: Fri, 11 Sep 2009 02:55:42 +0200
> >From: Thomas Gelf <thomas at gelf.net <mailto:thomas at gelf.net>>
> >Subject: Re: [OpenSIPS-Devel] questions about inter-domain roaming
> >To: devel at lists.opensips.org <mailto:devel at lists.opensips.org>
> >Message-ID: <h8c76d$up3$1 at ger.gmane.org <mailto:1 at ger.gmane.org>>
> >Content-Type: text/plain; charset=UTF-8
> >
> >zhangchao00001 wrote:
> >> Hello everybody, I have some questions about Inter-domain Roaming.
> >> ...
> >> Here is my experiment environment(the picture above):there are two
> >> Domains A and B, C1?C2 belong to Domain A, C3 to Domain B, P1 and P2
> >> are proxy server. C1 roams in Domain B and register to P1 through P2.
> >> then C2 want to make a telephone to C1...
> >
> >It doesn't matter where C1 is to be found, it will always be registered
> >to P1. P1 will be able to reach it, takes care of keepalives, NAT fixes
> >etc. Both P1 and P2 shall obviously record_route. Doing so C2 will
> >always be able to call C1 (using it's proxy P1).
> >
> >If C3 wants to call C1 (belonging to a foreign domain) it shall use P2
> >as outbound proxy, P2 will look up C1's domain (eventually repecting
> >SRV records) and send the call to P1. As we learned before, P1 will
> >be able to contact C1.
> >
> >There will be no SIP packets from peer to peer, if you allow that (and
> >don't record_route) you will be lost.
> >
> >Best regards,
> >Thomas Gelf
> >
> >--
> > mail: thomas at gelf.net <mailto:thomas at gelf.net>
> > web: http://thomas.gelf.net/
> >
> >
> >
> >
> >------------------------------
> >
> >Message: 3
> >Date: Fri, 11 Sep 2009 05:58:46 +0200
> >From: Thomas Gelf <thomas at gelf.net <mailto:thomas at gelf.net>>
> >Subject: [OpenSIPS-Devel] Test results for per-branch reply routes
> >To: devel at lists.opensips.org <mailto:devel at lists.opensips.org>
> >Message-ID: <h8chtj$j4g$1 at ger.gmane.org <mailto:1 at ger.gmane.org>>
> >Content-Type: text/plain; charset=ISO-8859-15
> >
> >Hi All,
> >
> >I can report that it works like a charme, as it has been promised!
> >Tried forking call to NAT and non-NAT UAC, uac_replac_both branches,
> >short: all kind of bad stuff ;-)
> >
> >The only thing I discovered failing badly: uac_replace_to works if
> >called in a branch route - however if there are multiple branches
> >restoring To: in reply packets fails badly.
> >
> >Best regards,
> >Thomas Gelf
> >
> >--
> > mail: thomas at gelf.net <mailto:thomas at gelf.net>
> > web: http://thomas.gelf.net/
> >
> >
> >
> >
> >------------------------------
> >
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> >
> >
> >End of Devel Digest, Vol 15, Issue 19
> >*************************************
>
>
>
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