SIP/2.0 200 OK To: ;tag=c57H8yQg91vaB Contact: User-Agent: FreeSWITCH-mod_sofia/1.0.pre4-8019 Accept: application/sdp Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO Supported: 100rel, precondition, timer Allow-Events: talk