PROVIDING IMPROVED POST-DIAL DELAY AT AN ORIGINATING TERMINAL

摘要

To provide expedited ringback at an originating terminal, a call request is sent from the originating terminal to a destination device over an Internet Protocol (IP) network. Local resource reservation is performed by the originating terminal after sending the call request. A first message is received by the originating terminal prior to the originating terminal sending a second message indicating that local resource reservation has been performed, the first message for indicating that alerting is being performed at the destination device. In response to receiving the first message and determining that the local resource reservation has been performed, a ringback indicator is generated by the originating terminal.

主权项

1. A method of operating an Internet Protocol network to establish a call between an originating terminal and a destination terminal, the method comprising, at a call control function of the Internet Protocol network:
receiving a call request from the originating terminal the call request requesting establishment of a packet-switched call session with the destination terminal over the Internet Protocol network; performing local resource reservation for the destination terminal; performing local resource reservation for the originating terminal; and before completing local resource reservation for the originating terminal, sending a ring message to the originating terminal to enable expedited ringback at the originating terminal.