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[reSIProcate] reCon default SDP issues (fmtp, DTMF, ptime)





a=fmtp:105 0-15

- should we include anything else in the default, e.g. 0-16?

https://github.com/resiprocate/resiprocate/blob/master/resip/recon/ConversationManager.cxx#L621



a=ptime:20

https://tools.ietf.org/html/rfc4566#section-6

- code comment suggests it is troublesome

https://github.com/resiprocate/resiprocate/blob/master/resip/recon/ConversationManager.cxx#L645

- should we just leave it out by default, will it cause problems for
anybody if I remove it?



a=rtpmap:105 TELEPHONE-EVENT/8000

- uppercase TELEPHONE-EVENT is valid but appears to cause issues with
Polycom

https://community.polycom.com/t5/VoIP-SIP-Phones/VVX-and-Soundpoint-not-sending-DTMF-when-telephone-event-not/m-p/101622/highlight/false