Bob recommended answer only those payloads it understand (without 101).
Refer rfc2327 on payload negotiation rules.

В Птн, 02/12/2005 в 15:21 +0530, Jayantheesh Sirmushnam - NPD, Chennai
пишет:
> Hi All,
> 
>  
> 
> Alice's offer
> 
> =========
> 
> v=0
> 
> o=jayanteeshs 2854 0 IN IP4 10.105.2.136
> 
> s=Voice Chat
> 
> c=IN IP4 10.105.2.136
> 
> t=0 0
> 
> m=audio 7100 RTP/AVP 0 101
> 
> a=sendrecv
> 
> a=rtpmap: 0 PCMU/8000
> 
> a=rtpmap: 101 telephone-event/8000
> 
>  
> 
>    Here "telephone-event" is a dynamic payload.
> 
>  
> 
>    If Bob does not understand the "telephone-event" (i.e. it does not
> support the DTMF), what should he do??
>    I guess the following
> 
> 1.         Bob has to send 4xx error response 
> 
> 2.         Send answer without the "telephone-event" in the SDP. 
> 
>  
> 
> Which should I follow??  
> 
>  
> 
> Thanks and regards
> 
> Jayanteeshs.
> 
>  
> 
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-- 
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