Abstract: A method for establishing a packet switched call at an access terminal, which is processing an established circuit switched call, enables a user to be informed that the packet switched call has been requested. The method comprises adding a call type indication to a call setup message in a serving network, where the call type indication indicates that the packet switched call is requested to be setup in a packet data radio access network in the serving network (step 1105). A message indicating that the packet switched call has been requested is then transmitted from a circuit switched base station to the access terminal (step 1115). A message indicating that the packet switched call has been accepted is then transmitted from the circuit switched base station to the mobile switching center (step 1125).

Abstract: 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).