rfc - Processing FMTP line above RTP line in a SIP SDP body? -

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sdp rfc silent on sequence of codecs . question can send fmtp line above rtpmap?

there no standard codec dependent. if software includes codec's, should pass these parameters codec interface or configure codec accordingly. each codec expects different parameters, there no high-level format should respected.the processing differs codec codec. sometime contains values can omitted, contains important parameters must used accordingly.

the format this: a=fmtp payloadnumber parameters_separated_by_semicolon

for example g.723 can have this:

a=fmtp:4 bitrate=6.3;annexa=yes

or g.729:

a=fmtp:18 annexb=yes

or speex:

a=fmtp:105 mode=8;mode=any


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