[Asterisk-Dev] FW: Payload numbers (X-Lite to Asterisk codec problem)

[mawali at news.icns.com]

Oh ye, most of the problems I have seen in VOIP are related to payload 
number, if that is what I think it is. Most of the people call it 
packetization peroid, or VoiceFramesPerPacket. I dont know why but most 
signalling applications fail here sometimes for some reason (including 
commercial signalling stacks). I usually fix it by lowering it if it is 
too high, or raising it if it is too low.


Regards


On Fri, 22 Aug 2003, Peter Grace wrote:

>  
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> Anyone know how to make sense of this?  I'm pretty dumb
> when it comes to the rtp protocol.  If someone can confirm
> this is a bug, we can put it into bugs.digium.com...
> 
> Pete
> 
> - -----Original Message-----
> From: Robin Raymond [mailto:robin at xten.com] 
> Sent: Friday, August 22, 2003 6:48 PM
> To: Peter Grace
> Subject: RE: Payload numbers
> 
> 
> 
> Hi Peter,
> 
> Well, from what I understand by this user, Asterisk is not
> examining the RTP payload number for speex or iLBC that
> X-Lite is using.
> 
> In the INVITE request, I tell Asterisk which codec payload
> numbers I'm using, which is different that what Asterisk
> sends back. Asterisk reports back it's payload numbers. I
> send my RTP using your speex/iLBC payload numbers that you
> expect from your SDP, and I expect RTP to come back with my
> speex/iLBC payload numbers that I provided in my SDP. Now
> I'm not 100% sure I'm doing that right, so perhaps I have a
> bug.
> 
> v=0
> o=21186 21339250 21339250 IN IP4 64.180.128.147
> s=X-PRO
> c=IN IP4 64.180.128.147
> t=0 0
> m=audio 8000 RTP/AVP 0 8 3 98 97 101
> a=rtpmap:0 pcmu/8000
> a=rtpmap:8 pcma/8000
> a=rtpmap:3 gsm/8000
> a=rtpmap:98 iLBC/8000 <-- this is my mapping
> a=rtpmap:97 speex/8000 <-- this is my mapping
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> 
> As what I understand, calling w/ speex/iLBC simply doesn't
> work between X-Lite and Asterisk. Not sure why.
> 
> No I didn't receive the e-mail about the PPC. Feel free to
> CC me on stuff like that :)
> 
> Any ideas?
> 
> - -Rob
> 
> 
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