Patent ID: 7280502
Filing Date: 2007-10-09
Classification: H04L,H04W

Abstract:
1. A method for a push-to-talk communication device including an operating mode to indicate said operating mode to a push-to-talk network server, said method comprising: employing as the operating mode of said push-to-talk communication device one of a first answer mode and a second answer mode; employing a communication network including a push-to-talk network server; indicating said operating mode in a Session Initiation Protocol message from said push-to-talk communication device to said push-to-talk network server over said communication network; employing as said first answer mode an automatic-answer mode; employing as said second answer mode a manual-answer mode; employing as said communication network an Internet Protocol core network; employing as said push-to-talk network server an Internet Protocol push-to-talk network server; registering the operating mode of said push-to-talk communication device with said Internet Protocol push-to-talk network server; employing a Session Initiation Protocol registrar on said Internet Protocol core network; sending a first Session Initiation Protocol Register message from said push-to-talk communication device to said Session Initiation Protocol registrar; employing as the operating mode of said push-to-talk communication device said automatic-answer mode; and including in said first Session Initiation Protocol Register message a header having a parameter representing said automatic-answer mode.