4.3.1.2 Step 8: INVITE Message Is Received by the UAC

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 This call originates from the private branch exchange (PBX); therefore, it includes an ms-call-source header.

INVITE sip:10.56.66.167:3080;transport=tls;ms-opaque=0e2b3bcc10;ms-received-cid=300 SIP/2.0
Record-Route: <sip:server1.example.com:5061;transport=tls;ms-role-rs-from;lr;ms-identity=B5buGzyhwo49ocKOaabbgxdAqaQRu_k9cZxy4WI-659Sq6MHw6Lt2WZQAA;ms-route-sig=aa3Oeh935IYJmaV5AyTn4katb_Zd-6MHw6Lt2WZQAA>;tag=8951C70C798E10EA48EB96EAA4B379BC
Via: SIP/2.0/TLS 172.29.106.3:5061;branch=z9hG4bKD300E89E.BA307C3A;branched=TRUE;ms-internal-info="aaKlz4lwQeqhL-R5X7wnN8hEhuJwK6MHw6hbkIPAAA"
Authentication-Info: NTLM rspauth="0100000000000000A761D372F9C08F09", srand="51ED7291", snum="32", opaque="FB347BC6", qop="auth", targetname="server1.example.com", realm="SIP Communications Service"
Max-Forwards: 69
Content-Length: 934
Via: SIP/2.0/TLS 10.198.92.126:4757;branch=z9hG4bK557e25e3;ms-received-port=4757;ms-received-cid=700
From: <sip:2160;phone-context=dialstring@example.com;user=phone>;epid=6477F45221;tag=a3a3579bb
To: <sip:+15555550108@example.com;user=phone>;epid=782abb8f70
CSeq: 179 INVITE
Call-ID: 729ab37d-c0f5-4ad7-b7e0-8f3dadb99065
Contact: <sip:SH13-LCT.example.com@example.com;gruu;opaque=srvr:MediationServer:TIRig7bu5kGXhNJb1ZwQfgAA;grid=2cfb52f9fd4b4930a6f0a82dbfcd39e4>;isGateway
Supported: replaces
Supported: gruu-10
User-Agent: RTCC/3.0.0.0 MediationServer
Content-Type: application/sdp; charset=utf-8
Allow: UPDATE
Allow: Ack, Cancel, Bye,Invite,Refer
Ms-Call-Source: non-ms-rtc