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The following is an example of the SIP UPDATE method:
Via: SIP/2.0/UDP pc33.<domain_name>.com;branch=<branch id>
;received=<ip_address>
To: <sip: email id>;tag=<tag number>
From: <name>
<sip:email id>;tag= <tag number>
Call-ID: <call_id>
CSeq: 63104 OPTIONS
Contact: <sip: email id>
Contact: <mailto: email id>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, UPDATE
Accept: application/sdp
Accept-Encoding: gzip
Accept-Language: en
Supported: foo
Content-Type: application/sdp
Content-Length: 274