4.3.1.4 Step 12: 200 Message Is Sent from the UAC

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 The first INVITE from a protocol client is accepted and the following 200 OK is sent.

SIP/2.0 200 OK
Via: SIP/2.0/TLS 172.29.106.3:5061;branch=z9hG4bK76F2CFD5.31901062;branched=TRUE;ms-internal-info="aaC8UGYE_vlAjm36glJ1-v1NQi15UxkBBihbkIPAAA"
Via: SIP/2.0/TLS 10.56.64.148:3981;ms-received-port=3981;ms-received-cid=200
From: "test2"<sip:test2@example.com>;tag=08399379aa;epid=7d725e08a1
To: "" <sip:test1@example.com>;epid=782abb8f70;tag=281b612cd0
Call-ID: ee22d219e9f44441bbac7b304ddc1096
CSeq: 1 INVITE
Record-Route: <sip:server1.example.com:5061;transport=tls;ms-role-rs-to;ms-role-rs-from;lr;ms-route-sig=aa1PYPSx-ubLAoi5ZiOqMHlGcU3l0xkBBiLt2WZQAA>;tag=8951C70C798E10EA48EB96EAA4B379BC
Contact: <sip:test1@example.com;opaque=user:epid:reTyjuqAaVmcCIO4qlA4vwAA;gruu>
User-Agent: UCCP/2.0.6362.0 OC/2.0.6362.0 (Client)
P-Preferred-Identity: <sip:test1@example.com>, <tel:+15555550100>
Proxy-Authorization: NTLM qop="auth", realm="SIP Communications Service", opaque="FB347BC6", crand="1b602324", cnum="30", targetname="server1.example.com", response="010000006895aa03478d7d34f9c08f09"
Content-Type: application/sdp