I think you need to represent in two lines
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
Somesh S Shanbhag
M G L Bangalore
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of [EMAIL PROTECTED]
Sent: Mon 11/3/2008 6:08 PM
To: sip-implementors@lists.cs.columbia.edu
Subject: [Sip-implementors] rtpmap:18 G729a/8000 ?
Hi,
Please let me know if "rtpmap:18 G729a/8000" is a wrong format.
I guess RFC3551 says it should work (page 19, as pasted below) and I am
not able to find anything so specific in RFC3550.
--------------------------------------------------------------------------------------------
4.5.6 G729
G729 is specified in ITU-T Recommendation G.729, "Coding of speech at
8 kbit/s using conjugate structure-algebraic code excited linear
prediction (CS-ACELP)". A reduced-complexity version of the G.729
algorithm is specified in Annex A to Rec. G.729. The speech coding
algorithms in the main body of G.729 and in G.729 Annex A are fully
interoperable with each other, so there is no need to further
distinguish between them. An implementation that signals or accepts
use of G729 payload format may implement either G.729 or G.729A
unless restricted by additional signaling specified elsewhere related
specifically to the encoding rather than the payload format. The
G.729 and G.729 Annex A codecs were optimized to represent speech
with high quality, where G.729 Annex A trades some speech quality for
an approximate 50% complexity reduction [10]. See the next Section
(4.5.7) for other data rates added in later G.729 Annexes. For all
data rates, the sampling frequency (and RTP timestamp clock rate) is
8,000 Hz.
----------------------------------------------------------------------------------------------
Thanks & Regards
Viresh Gupta
Manager - International Network Planning
Enterprise Services, Bharti Airtel Limited,
234, Okhla Industrial Area, Phase- III,
New Delhi - 110020, India
D
(91) 1141711283
M
(91) 9871008236
E
[EMAIL PROTECTED]
Airtel for Business
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