SIP Registration Example

	Bob registers on start-up.  The message flow is shown in Figure 9.
   Note that the authentication usually required for registration is not
   shown for simplicity.

 biloxi.com         Bob's
                   registrar       softphone
                      |                |
                      |   REGISTER F1  |
                      |<---------------|
                      |    200 OK F2   |
                      |--------------->|

                  Figure 9: SIP Registration Example

   F1 REGISTER Bob -> Registrar

       REGISTER sip:registrar.biloxi.com SIP/2.0
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Max-Forwards: 70
       To: Bob <sip:
 This e-mail address is being protected from spambots. You need JavaScript enabled to view it
 >
       From: Bob <sip:
 This e-mail address is being protected from spambots. You need JavaScript enabled to view it
 >;tag=456248
       Call-ID: 843817637684230@998sdasdh09
       CSeq: 1826 REGISTER
       Contact: <sip:bob@192.0.2.4>
       Expires: 7200
       Content-Length: 0

   The registration expires after two hours.  The registrar responds
   with a 200 OK:

   F2 200 OK Registrar -> Bob

        SIP/2.0 200 OK
        Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
         ;received=192.0.2.4
        To: Bob <sip:
 This e-mail address is being protected from spambots. You need JavaScript enabled to view it
 >;tag=2493k59kd
        From: Bob <sip:
 This e-mail address is being protected from spambots. You need JavaScript enabled to view it
 >;tag=456248
        Call-ID: 843817637684230@998sdasdh09
        CSeq: 1826 REGISTER
        Contact: <sip:bob@192.0.2.4>
        Expires: 7200
        Content-Length: 0