Description:

Bob wishes to cancel their registration with the SIP server.  Bob sends a SIP REGISTER request to the SIP server.  The request has an expiration period of 0 and applies to all existing contact locations. Since the user already has authenticated with the server, the user supplies authentication credentials with the request and is not challenged by the server.  The SIP server validates the user’s credentials.  It clears the user’s contact list, and returns a  response (200 OK) to Bob’s SIP client.
 

Popis:

Bob si praje zrušiť registráciu so svojím SIP serverom. Zašle preto správu REGISTER v ktorej oznámi prostredníctvom parametra Expires: 0 že jeho v tomto momente expiruje jeho kontakt list. V správe REGISTER zašle aj potrebné overovacie údaje a server v prípade zhody expiruje kontakty v kontaktliste a zašle odpoveď 200 OK bobovmu klientovi.

Click on the message during the exchange