[speex-dev] Speex SIP support in the "Asterisk" PBX, FYI
jean-marc.valin at hermes.usherb.ca
Tue Mar 11 20:12:45 PST 2003
> Unfortunately, the sampling frequency is also the RTP timestamp frequency,
> so if Asterisk thinks that the stream is 8 kHz, but the Speex client thinks
> that it's 16 kHz, then each side will probably misinterpret the RTP
> timestamps sent by the other side.
Well, the timestamp will be the same. A wideband frame is a narrowband
frame with additional information to describe the high-band (4-8 kHz). A
narrowband decoder will just ignore that additional info, while a
wideband decoder will use it to produce 16 kHz. In all cases, the frames
are 20 ms.
Jean-Marc Valin, M.Sc.A.
Université de Sherbrooke, Québec, Canada
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