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System, apparatus, and method for enhancing mobile communication terminal push to talk service

  • US 7,684,814 B2
  • Filed: 12/30/2005
  • Issued: 03/23/2010
  • Est. Priority Date: 12/30/2004
  • Status: Expired due to Fees
First Claim
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1. A system for enhancing a mobile communication terminal PTT service, the system comprising:

  • a sender'"'"'s mobile communication terminal for transmitting a voice message;

    a recipient'"'"'s mobile communication terminal for generating and transmitting a first alert message indicating a first state and a second alert message indicating a second state;

    a Voice Message System (VMS) server for storing the voice message sent from the sender'"'"'s terminal; and

    a Session Initiation Protocol (SIP) proxy server for storing the voice message on the VMS server when the recipient'"'"'s terminal is in the first state and for transmitting the stored voice message to the recipient'"'"'s terminal when the SIP proxy server receives a request message from the recipient'"'"'s terminal and when the recipient'"'"'s terminal is in the second state.

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