> -----Original Message-----
> From: Takumi Ohba [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, April 26, 2001 8:39 AM
> To: [EMAIL PROTECTED]
> Subject: RE: [Sip-implementors] Codec negotiation questions (SDP)
>
>
> Hi,
>
> I would like to add another question concerning codec negotiation.
>
> At 4:22 PM -0400 01.4.25, Brett Tate wrote:
> > Note: the codecs in an SDP only signify the
> > listening codecs. They are not used to
> > identify what you plan to send unless maybe
> > a oneway media session is being established.
>
> If an SDP includes multiple codecs, the sender of the SDP
> must be able to
> receive any RTP packets whichever codec in the SDP is used
> during a call.
> In this case, the sender of the SDP must check the PT field
> in each RTP
> packet and decide the way of decoding for each packet.
>
> On the other hand, if one codec were selected during a call setup, the
> performance for the decoding wuold be greatly improved.
>
> What is the merit of allowing multiple codecs for one RTP stream?
> Is there any positive reason why SIP does not negotiate
> codecs to select
> only one for one RTP stream?
See:
http://www.cs.columbia.edu/~hgs/sip/faq/cache/103.html
---
Jonathan D. Rosenberg 72 Eagle Rock Ave.
Chief Scientist First Floor
dynamicsoft East Hanover, NJ 07936
[EMAIL PROTECTED] FAX: (973) 952-5050
http://www.jdrosen.net PHONE: (973) 952-5000
http://www.dynamicsoft.com
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