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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
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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