Gurus,

If party-A in a call wants to put the other party(B) on hold, it should 
reinvite that party with a sendonly media stream offer. Party-B answers 
with a recvonly media stream - the media is now one-way from A to B. 
Typically, according to RFC3264 section 8.4, party-A should locally mute.

However, the question arises when dealing with e.g. music on hold and 
call-progress tones. In the situation described above, party-B would be 
responsible for generating a call-progress tone locally. But if party-A 
would not mute, but instead send media (music on hold or whatever) party-B 
should not generate call-progress tones.

Is there a general way for party-B to decide to either generate 
call-progress-tones or to play the media?

Thanks,

Martin.
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