<DIV>Dear sir: </DIV>
<DIV> NAT<BR>Register: C1--------->P2-------->P1<BR>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<BR>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 <BR>In both cases, C2 will not telephone with C1 sucessfully. We suppose that C1 must register to P1 through P2 <BR> C1 NAT P2 P1 C2<BR> | | | | |<BR> | INVITE | | | |<BR> |-------->|--------->| | |<BR> | | |------->| |<BR> | | | |-------->|<BR> | | | | |<BR>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 ?<BR></DIV>
<DIV></DIV><BR><PRE>在2009-09-11，<A href="mailto:devel-request@lists.opensips.org">devel-request@lists.opensips.org</A> 写道：
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> 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)
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>----------------------------------------------------------------------
>
>Message: 1
>Date: Fri, 11 Sep 2009 08:40:26 +0800 (CST)
>From: zhangchao00001 <<A href="mailto:zhangchao0000198@163.com">zhangchao0000198@163.com</A>>
>Subject: [OpenSIPS-Devel] questions about inter-domain roaming
>To: opensip-devel <<A href="mailto:devel@lists.opensips.org">devel@lists.opensips.org</A>>
>Message-ID:
> <<A href="mailto:23006491.29551252629626844.JavaMail.coremail@app180.163.com">23006491.29551252629626844.JavaMail.coremail@app180.163.com</A>>
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>
>Hello everybody, I have some questions about Inter-domain Roaming.
>________________________________
>| |
>| C1@DomainA C3@DomainB |
>|_______________________________|
>|_____________NAT_______________|Domain B
>| |
>|_____________P2________________|
> |
> |
> |
> __________|___________
> | |
> | P1(S1) |
> | |
> | |
> | C2@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.
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>------------------------------
>
>Message: 2
>Date: Fri, 11 Sep 2009 02:55:42 +0200
>From: Thomas Gelf <<A href="mailto:thomas@gelf.net">thomas@gelf.net</A>>
>Subject: Re: [OpenSIPS-Devel] questions about inter-domain roaming
>To: <A href="mailto:devel@lists.opensips.org">devel@lists.opensips.org</A>
>Message-ID: <h8c76d$up3$<A href="mailto:1@ger.gmane.org">1@ger.gmane.org</A>>
>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: <A href="mailto:thomas@gelf.net">thomas@gelf.net</A>
> web: http://thomas.gelf.net/
>
>
>
>
>------------------------------
>
>Message: 3
>Date: Fri, 11 Sep 2009 05:58:46 +0200
>From: Thomas Gelf <<A href="mailto:thomas@gelf.net">thomas@gelf.net</A>>
>Subject: [OpenSIPS-Devel] Test results for per-branch reply routes
>To: <A href="mailto:devel@lists.opensips.org">devel@lists.opensips.org</A>
>Message-ID: <h8chtj$j4g$<A href="mailto:1@ger.gmane.org">1@ger.gmane.org</A>>
>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: <A href="mailto:thomas@gelf.net">thomas@gelf.net</A>
> web: http://thomas.gelf.net/
>
>
>
>
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>End of Devel Digest, Vol 15, Issue 19
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