I would like to add user-to-user: information in a pjsip outbound invite so the invite looks something like this: 18:51:53.893 CALL(SIP) (04:00003:01) <--- [10.129.47.147, 5060 <- 10.129.44.171, 5060] INVITE sip:2145551212 at 10.129.47.147:5060 SIP/2.0\r\n Via: SIP/2.0/UDP 10.129.44.171:5060;rport;branch=z9hG4bK -5d5a-1196967113-19997-373\r\n Call-ID: 1b0b-402-1162007185153-ANSI_SIP_UUI-4 at 10.129.44 .171\r\n CSeq: 1 INVITE\r\n Max-Forwards: 70\r\n To: <sip:2145551212 at 10.129.47.147:5060>\r\n From: <sip:2125551212 at 10.129.44.171>;tag=95ffcd055e0f78f 7d5d397020e89288d96b52669\r\n User-Agent: Cantata-SIP/10.5.0.148 ANSI_SIP_UUI 4\r\n User-to-User: THE QUICK BROWN FOX JUMPS OVER THE LAZY DO G\r\n Contact: <sip:2125551212 at 10.129.44.171:5060>\r\n Allow: INVITE, BYE, REGISTER, ACK, OPTIONS, CANCEL, SUBS CRIBE, NOTIFY, INFO, UPDATE\r\n Supported: path, timer\r\n Session-Expires: 1800\r\n Expires: 300\r\n Organization: Dialogic Inc\r\n Content-Type: application/sdp\r\n Content-Length: 164\r\n \r\n v=0\r\n o=Cantata_SDP 0 0 IN IP4 10.129.44.171\r\n s=Cantata-SIP\r\n c=IN IP4 10.129.44.166\r\n t=0 0\r\n m=audio 8008 RTP/AVP 0\r\n a=rtpmap:0 PCMU/8000\r\n a=silenceSupp:off - - - -\r\n Any ideas how to get the user-to-user:string field to show up like it goes here? Thanks, David Clark