| 摘要 |
A method that incorporates teachings of the subject disclosure may include, for example, receiving a query from a call session server for a first pointer associated with a telephone number of a terminating device of a requested communication session, transmitting to the call session server the first pointer including a session initiation protocol uniform resource identifier associated with the terminating device to initiate an internet protocol communication session, receiving a notification from the call session server responsive to the call session server failing to initiate the internet protocol communication session, and transmitting to the call session server a second pointer including a telephone protocol uniform resource identifier for originating a circuit-switched communication session responsive to receiving the notification. Other embodiments are disclosed. |
