Calls are established with a single mobile terminal through either a wireless network or via a terminal adaptor over the PSTN or a packet network. The terminal adaptor and mobile terminal communicate via a local wireless interface. The mobile terminal may facilitate cellular calls via the wireless network as well as PSTN or packet-based calls via the terminal adaptor. The mobile terminal may initiate a handoff when it is involved in a call through the wireless network and within a communication zone of the terminal adaptor. The handoff will establish a connection between the wireless switch, which is currently supporting the call, and the mobile terminal through the terminal adaptor. Once the connection with the mobile terminal through the terminal adaptor is established, the call is transitioned to the new connection and the mobile terminal will transfer to the local wireless interface to support the call.