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SIP-based multimedia communication system capable of providing mobility using lifelong number and mobility providing method

  • US 20050125543A1
  • Filed: 09/15/2004
  • Published: 06/09/2005
  • Est. Priority Date: 12/03/2003
  • Status: Active Grant
First Claim
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1. An SIP (Session Initiation Protocol)-based multimedia communication system, comprising SIP network service domains that provide mobility based on a logical SIP identifier allocated to each of users, and a global domain that integratively manages the SIP network service domains and allocates a global SIP identifier that is a lifelong number to each user to provide user-centered mobility, wherein each of the SIP network service domain comprises:

  • a user agent that transmits request/response messages between users to set up, correct, and cancel a call, and when contact information of the user agent is registered and registration of the contact information is cancelled, requests to be informed of a state change in registration information; and

    an SIP network server that carries out message routing between user agents and informs of the contact information of the user agents during message routing.

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