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4.1.2 Basic Unregistration

The user unregisters from the SIP registrar by sending a REGISTER request with an Expires: 0 header, as follows.

  
 REGISTER sip:fabrikam.com SIP/2.0
 Via: SIP/2.0/TLS 10.1.2.50:4237
 Max-Forwards: 70
 From: <sip:alice@fabrikam.com>;tag=2d0be03279;epid=492a7ce35f
 To: <sip:alice@fabrikam.com>
 Call-ID: 74c55d45a6ee404680aa55c8fe126f11
 CSeq: 3 REGISTER
 Contact: <sip:10.1.2.50:4237;transport=tls;ms-opaque=6fb3a8330a>;methods="INVITE, MESSAGE, INFO, OPTIONS, BYE, CANCEL, NOTIFY, ACK, REFER, BENOTIFY";proxy=replace;+sip.instance="<urn:uuid:B43B3D1D-9F8F-5FDC-9F74-3CA273CADB97>"
 User-Agent: UCCP/2.0.6362.0 OC/2.0.6362.0 (Microsoft Office Communicator)
 Authorization: NTLM qop="auth", realm="SIP Communications Service", targetname="ocs.fabrikam.com", gssapi-data="TlRMTVNTUAADAAAAGAAYAHoAAAAYABgAkgAAAAoACgBIAAAAEAAQAFIAAAAYABgAYgAAABAAEACqAAAAVYKQQgUCzg4AAAAPTgBUAEQARQBWAHMAVQBuAGsAYQByAGEAbgBTAEEATgBLAEEAUgBBAE4ALQBEAEUAVgDnJVs84fE59ziCDecY7XprbBXcdABFbpbnJVs84fE59ziCDecY7XprbBXcdABFbpZwMLke/elE9fi69enePNxU", opaque="99052D67", version=3
 Allow-Events: vnd-microsoft-provisioning,vnd-microsoft-roaming-contacts,vnd-microsoft-roaming-ACL,presence,presence.wpending,vnd-microsoft-roaming-self,vnd-microsoft-provisioning-v2
 Supported: gruu-10, adhoclist, msrtc-event-categories
 ms-keep-alive: UAC;hop-hop=yes
 Event: registration
 Expires: 0
 Content-Length: 0

The server responds with a 200 OK response, terminating the registration.

 SIP/2.0 200 OK
 ms-keep-alive: UAS; tcp=no; hop-hop=yes; end-end=no; timeout=300
 Authentication-Info: NTLM rspauth="0100000000636F6E9575D2297F8F5EF3", srand="168CE345", snum="1", opaque="99052D67", qop="auth", targetname="ocs.fabrikam.com", realm="SIP Communications Service"
 From: <sip:alice@fabrikam.com>;tag=2d0be03279;epid=492a7ce35f
 To: <sip:alice@fabrikam.com>;tag=0D08337B2339766A952BC5B9D8E0A41A
 Call-ID: 74c55d45a6ee404680aa55c8fe126f11
 CSeq: 3 REGISTER
 Via: SIP/2.0/TLS 10.1.2.50:4237;received=10.54.78.109;ms-received-port=4237;ms-received-cid=10A0D00
 Allow-Events: vnd-microsoft-provisioning,vnd-microsoft-roaming-contacts,vnd-microsoft-roaming-ACL,presence,presence.wpending,vnd-microsoft-roaming-self,vnd-microsoft-provisioning-v2
 Supported: adhoclist, msrtc-event-categories
 Expires: 0
 Server: RTC/3.0
 Content-Length: 0