Ethereal-users: RE: [Ethereal-users] Tracing RTP with AMR payload

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From: "Anders Broman (AL/EAB)" <anders.broman@xxxxxxxxxxxx>
Date: Mon, 19 Sep 2005 12:52:22 +0200
Hi,
It could also be non-octet aligned, the setup information in TerminalCapabillitySet and OpenLogicalChannelAck might be of help.
Reading the RFC there seems not yo be any good way to figure out the encoding from the payload.
Brg
Anders
-----Original Message-----
From: ethereal-users-bounces@xxxxxxxxxxxx [mailto:ethereal-users-bounces@xxxxxxxxxxxx]On Behalf Of Juan Francisco Navarro
Sent: den 19 september 2005 11:35
To: Ethereal user support
Subject: Re: [Ethereal-users] Tracing RTP with AMR payload

Thank you, Anders.
 
After reading 3GPP TS 26.101 v.6.0.0, I think that maybe the RTP payload is simply an AMR IF2... Is this possible?
 
BR,
----- Original Message -----
Sent: Monday, September 19, 2005 10:25 AM
Subject: RE: [Ethereal-users] Tracing RTP with AMR payload

Hi,
If you can send me the file I'll take a look.
Brg
Anders
-----Original Message-----
From: ethereal-users-bounces@xxxxxxxxxxxx [mailto:ethereal-users-bounces@xxxxxxxxxxxx]On Behalf Of Juan Francisco Navarro
Sent: den 18 september 2005 21:14
To: ethereal-users@xxxxxxxxxxxx
Subject: [Ethereal-users] Tracing RTP with AMR payload

Hi,
 
I have a trace with RTP packets containing an AMR payload. The problem is that Ethereal shows strange information. Is it possible that the payload is not following the rfc 3267 recommendations?. What I need to know is how the payload header is built, and where are the speech bits. Below there are some sample RTP packets. Could anybody help me?
 
80 60 3b 51 00 00 54 b0 55 dd 3e d2     b7 2f a4 d6 82 40 9d 09 89 79 3c 7f 80 2a be 5a e2 07 08 00 10 80 01 c8 dc b0 03 12 82 74 02
------------------------------------------------------   -------------------------------------------------------------------------------------------------------------------------------------------
    RTP header (seems OK)                                            AMR (where is the payload header according to RFC 3267?? where are the speech bits?)
 
Ethereal shows the following:
 
CMR = PDC-EFR-SID
Reserved = 7
Payload table of contents:
(Empty, ethereal shows nothing)
 
Another example:
 
80 60 3b 52 00 00 55 50 55 dd 3e d2     07 86 60 5e b1 0e 11 70 31 67 fd af aa 60 ea 10 02 00 a2 c3 10 19 63 22 c9 a9 44 20 7a 63 c6
 
Ethereal shows the following:
 
CMR = AMR 4,75 kBits/s. (0)
Reserved = 7
Payload table of contents:
(Empty, ethereal shows nothing)
 
This trace has been obtained in a H.323 call between a 3G phone and a H.323 endpoint with AMR codec support through a 3G-IP gateway. I can send the trace file (20 kb, zipped if it's necessary).
 
Thanks in advance,

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