In many mailing lists I read of problems with SIP signaling protocol and call on hold. In the actual implementation, "hold" is not different from "mute". This problem also occurred during my work. I wrote this draft: http://tools.ietf.org/id/draft-giordano-sip-call-hold-revision-00.txt What's your opinion. Thanks. _______________________________________________ IETF mailing list IETF@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf