[OpenSIPS-Users] T38 and changing media port for T38 SDP

[Adrian Georgescu]

On Jul 7, 2010, at 12:27 AM, Julian Yap wrote:

> Hi All,
>
> I managed to get it working by adding a whole lot of debugging and a
> whole lot of rtpproxy_offer() and rtpproxy_answer().
>
> Now I need to clean up my config because it's a total mess.
>

You may want to try use mediaproxy if you do not like the mess. You  
need a single line of code in your opensips configuration to achieve  
this.

Adrian


> - Julian
>
> On Tue, Jul 6, 2010 at 10:07 AM, Bogdan-Andrei Iancu
> <bogdan at voice-system.ro> wrote:
>> Hi Julian,
>>
>> Do you trigger again the rtpproxy at re-INVITE time ? basically you  
>> need
>> to do the insertion of rtpproxy again, as for the initial INVITE.
>>
>> Regards,
>> Bogdan
>>
>> Julian Yap wrote:
>>> Any help greatly appreciated!
>>>
>>> I'm having problems with a T38 UA which changes port when  
>>> negotiating
>>> T38 media.  All the other UA's I've encountered thus far use the  
>>> same
>>> RTP port throughout.
>>>
>>> I'm also using RTPProxy.
>>>
>>> In the final 200 OK SDP, the UA changes media port from 49200 to  
>>> 49152
>>> but this changeover isn't detected and the media is sent back to  
>>> port
>>> 49200 so the call then fails to negotiate T38 properly.  Not sure  
>>> how
>>> to log the port changes to further debug this issue as well.
>>>
>>> Here is the flow:
>>> | UA                | OpenSIPS          | T38 GW            |
>>> |         INVITE SDP ( g711U)           |                   |
>>> |(5060)   ------------------>  (5060)   |                   |
>>> |         100 Trying|                   |                   |
>>> |(5060)   <------------------  (5060)   |                   |
>>> |                   |         INVITE SDP ( g711U)           |
>>> |                   |(5060)   ------------------>  (5060)   |
>>> |                   |         100 Trying|                   |
>>> |                   |(5060)   <------------------  (5060)   |
>>> |                   |         180 Ringing SDP ( g711U)      |
>>> |                   |(5060)   <------------------  (5060)   |
>>> |                   |         200 OK SDP ( g711U)           |
>>> |                   |(5060)   <------------------  (5060)   |
>>> |                   |         RTP (g711U)                   |
>>> |                   |(11392)  <------------------  (14110)  |
>>> |         RTP (g711U)                   |                   |
>>> |(49200)  <------------------  (10878)  |                   |
>>> |         180 Ringing SDP ( g711U)      |                   |
>>> |(5060)   <------------------  (5060)   |                   |
>>> |         RTP (g711U)                   |                   |
>>> |(49200)  ------------------>  (10878)  |                   |
>>> |                   |         RTP (g711U)                   |
>>> |                   |(11392)  ------------------>  (14110)  |
>>> |         200 OK SDP ( g711U)           |                   |
>>> |(5060)   <------------------  (5060)   |                   |
>>> |         ACK       |                   |                   |
>>> |(5060)   ------------------>  (5060)   |                   |
>>> |         RTP (g711U)                   |                   |
>>> |(49200)  ------------------>  (10878)  |                   |
>>> |         RTP (g711U)                   |                   |
>>> |(49200)  <------------------  (10878)  |                   |
>>> |                   |         200 OK SDP ( g711U)           |
>>> |                   |(5060)   <------------------  (5060)   |
>>> |                   |         RTP (g711U)                   |
>>> |                   |(11392)  ------------------>  (14110)  |
>>> |                   |         ACK       |                   |
>>> |                   |(5060)   ------------------>  (5060)   |
>>> |         200 OK SDP ( g711U)           |                   |
>>> |(5060)   <------------------  (5060)   |                   |
>>> |         ACK       |                   |                   |
>>> |(5060)   ------------------>  (5060)   |                   |
>>> |         RTP (g711U)                   |                   |
>>> |(49200)  ------------------>  (10878)  |                   |
>>> |         RTP (g711U)                   |                   |
>>> |(49200)  <------------------  (10878)  |                   |
>>> |                   |         ACK       |                   |
>>> |                   |(5060)   ------------------>  (5060)   |
>>> |                   |         INVITE SDP ( t38)             |
>>> |                   |(5060)   <------------------  (5060)   |
>>> |         INVITE SDP ( t38)             |                   |
>>> |(5060)   <------------------  (5060)   |                   |
>>> |         200 OK SDP ( t38)             |                   |
>>> |(5060)   ------------------>  (5060)   |                   |
>>>
>>> This is where it sends the 200 OK with a different media port.
>>>
>>> - Julian
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opensips.org
>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>>
>>>
>>
>>
>> --
>> Bogdan-Andrei Iancu
>> OpenSIPS Bootcamp
>> 20 - 24 September 2010, Frankfurt, Germany
>> www.voice-system.ro
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users at lists.opensips.org
>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>
>
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