| 摘要 |
<p>A method for establishing a circuit switched call at an access terminal that is processing an established packet switched call, enables a user to be informed that a voice call has been requested. The method comprises transmitting, from a visited network to the access terminal, a packet switched message indicating that the voice call has been requested (step 805). A message from the access terminal, indicating that the voice call is being processed, is then processed in the visited network (step 810). A message from the access terminal requesting a circuit switched call origination is then processed at a mobile switching center in the visited network (step 820). A message indicating that the circuit switched call should be established is then transmitted from the visited network to a voice call continuity application server in a home network, in response to the circuit switched call origination message (step 830). The circuit switched call is then connected (step 835).</p> |
