Hello everyone,
In the scenario that an UA wants to mute selective
codecs of an established call, how does it go about
doing the same? What I mean is if the established
session SDP is as follows:
v=0
o=Siddharth 4245157224 4245157224 IN IP4 139.89.125.125
s=SIP discussion
c=IN IP4 139.89.125.125
t=0 0
m=audio 1000/2 RTP/AVP 0 3 7
THEN, if the UA wants to mute the PCMU codec (format=0)
alone (and not the other 2 codecs), what does the mute
SDP look like? Assuming that the UA is using the existing
approach of sending a 0.0.0.0 address, does the Hold SDP
look like the following:
v=0
o=Siddharth 4245157224 4245157225 IN IP4 139.89.125.125
s=SIP discussion
c=IN IP4 139.89.125.125
t=0 0
m=audio 1000/2 RTP/AVP 0 3 7
a=fmtp:0 1000 IN IP4 0.0.0.0
Or is this usage of the 'fmtp' media attribute
incorrect? If so, what is the correct way to do the hold?
Do existing end-point implementations understand such a
media hold?
Regards,
Siddharth.
=================================
Siddharth Toshniwal
Software Engineer
Hughes Software Systems, Bangalore
http://www.hssworld.com
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