Require: timer Session-Expires: 90;refresher=uac Content-Type: application/sdp Content-Length: [len] v=0 o=Some-UserAgent 68 210 IN IP4 [local_ip] s=SIP Call c=IN IP4 [local_ip] t=0 0 m=audio 17294 RTP/AVP 0 101 c=IN IP4 [local_ip] a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 ]]> Require: timer Session-Expires: 90;refresher=uac Content-Type: application/sdp Content-Length: [len] v=0 o=Some-UserAgent 68 210 IN IP4 [local_ip] s=SIP Call c=IN IP4 [local_ip] t=0 0 m=audio 17294 RTP/AVP 0 101 c=IN IP4 [local_ip] a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 ]]>