Hi  Guys,

Per RFC 3665 Section 2.2. Update of Contact List

A UAC can send a REGISTER as shown below with the "Authorization" header to
update its contact lists. Now, my question is are there are any PBXs or VoIP
service providers s currently support this?

REGISTER sips:ss2.biloxi.example.com SIP/2.0
   Via: SIP/2.0/TLS client.biloxi.example.com:5061;branch=z9hG4bKnashds7
   Max-Forwards: 70
   From: Bob <sips:[email protected]
<sips%[email protected]>>;tag=a73kszlfl
   To: Bob <sips:[email protected] <sips%[email protected]>>
   Call-ID: [email protected]
   CSeq: 1 REGISTER
   Contact: mailto:[email protected]
   Authorization: Digest username="bob", realm="atlanta.example.com",
    qop="auth", nonce="1cec4341ae6cbe5a359ea9c8e88df84f", opaque="",
    uri="sips:ss2.biloxi.example.com",
    response="71ba27c64bd01de719686aa4590d5824"
   Content-Length: 0

Thanks for your time!
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