A communication management resource receives first input registering user equipment to use wireless network services of a first wireless network and a second wireless network. The communication management resource receives second input from the user equipment registering the user equipment to use voice services. In response to receiving a phone communication indicating a corresponding phone call, the communication management resource selects a transport protocol from multiple possible transport protocols to establish a communication session between the communication management resource and the user equipment. The communication management resource initially establishes a communication link or communication session for the corresponding phone call over the first wireless network between the user equipment and the communication management resource using the selected transport protocol. The user equipment is then handed off to a communication link in the second wireless network to support the corresponding phone call.