Additional Service Type Setup in Mobile Terminals Having Multiple Radio Access Network Accessiblity

摘要

In an area covered by multiple different radio access networks, a user equipment (UE) capable of accessing each of the multiple networks at the same time may provide additional service type setup for different call types. The UE registers each of the available call types with a first radio access network. Calls of one of the registered call types may be established, whether UE-originated or UE-terminated, with the first radio access network. When initiating a call of another type, the UE may initiate a different-typed call with another radio access network in the area, while maintaining the call of the first call type with the first radio access network.