I know that this has been discussed in the past but I am not sure what the
conclusion/concensus was. The question is whether attributes like ptime are
codec-specific or media specific? Some people have argued that these are media
specific properties and it is invalid for a SDP m line to have multiple ptime
values. The other school of thought claims that ptime is a codec specific
attribute. I am also inclined to go with the latter. Say in the m line a UA
advertises support for EVRC and G723. EVRC is a 20ms frame based codec while
G723 is a 30ms frame based codec. How should such an SDP be formulated if it is
invalid to have multiple ptimes in a media line? Please accept my apologies if
this topic has been discussed ad nauseam in the past.
Thanks,
-Ravi.
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