Not sure if there is a more appropriate list for this question, if so please forward.  
When it is desired to offer more than one codec for a particular stream, but different 
packetization intervals are desired for each codec, how is this accomplished?  It 
appears the ptime attribute is relevant for everything on the m= line.  For example, 
if we wish to send the below in an offer and would like to receive g711 at 20 ms and 
g729 at 30 ms, can this be done?  If a=ptime:30 is included and the answerer selects 
g711, will they send 30 ms packets?  This does not seem to be clearly covered in 
RFC3264 or other docs I've looked at.

m=audio 62986 RTP/AVP 0 18
a=rtpmap:0 PCMU/8000
a=rtpmap:18 G729/8000


John Hearty
Level 3

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