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[reSIProcate] Preserving order of attributes in sdp


I'm trying to add fax-capabilities according to RFC3407, but because of the map-implementation it is impossible to keep the order stated in the RFC:

"The individual capability descriptions in a capability set can be
provided contiguously or they can be scattered throughout the session
description. The first capability description MUST, however, follow
immediately after the sequence number."

v=0
o=4001 866981 866981 IN IP4 148.122.211.58
s=-
c=IN IP4 148.122.211.58
t=0 0
m=audio 10628 RTP/AVP 8 0
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=ptime:20
a=cpar: a=T38FaxVersion:0
a=cpar: a=T38MaxBitRate:14400
a=cpar: a=T38FaxRateManagement:transferredTCF
a=cpar: a=T38FaxMaxBuffer:336
a=cpar: a=T38FaxMaxDatagram:176
a=cpar: a=T38FaxUdpEC:t38UDPRedundancy
a=cdsc:1 image udptl t38
a=sqn:0

There is no way to get capacity description after the sequence number.

best regards
Björn A.






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