Re: codec change in H.323.

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Hallo Teodor
Teodor Georgiev writes:
 > 
 > Codec may be changed during the call.
 > The procedure (as far as I remember is the following):
 > 
 > If one of the sides want to renegotiate the codecs, it sends an empty H245 TCS 
 > (Terminal Capability Set). The "empty TCS" must close the current audio 
 > channel and then codec negotiation starts again. 
 > 
 > So:
 > 
 > it requires the current RTP stream to be closed and it does require the 
 > involvment of H245 (TCS is a H.245 message).
 > 
 > I am not sure since which version of H323 this is support. I am pretty sure 
 > that in H323v3 and later it is supported.
 > 
 > On Tuesday 29 August 2006 11:46, Pawel wrote:
 > > Hallo group members.
 > >
 > > I wonder whether codec may change in the middle of call. If Yes, how is it
 > > performed, I mean: does it require closing currently opened media channels
 > > or it is performed somewhere in the middle of RTP stream without any note
 > > to H.245 protocol? I did not find any info on that in H.323.pdf
 > > specification, that is why I decided to ask You.
 > >
 > > Regards,
 > > Pawel
 > >
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Do You mean the same procedure which is used for channel re-routing.

It is described in H.323 document, section 8.4.6 Third party initiated pause and re-routing.

Regards
Pawel

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