Packet switched voice service registration techniques with reduced overhead

An apparatus for managing a wireless user equipment device (UE), the apparatus comprising:

• a processing element configured to cause the UE to:
• provide a request relating to packet switched voice service to a cellular network entity associated with a cellular network;
• receive a response comprising an invalid proxy call session control function (P-CSCF) address;
• recognize that the invalid P-CSCF address is invalid;
• determine that the subscription of the UE does not include packet switched voice service from the cellular network based on the P-CSCF address being invalid;
• and
• refrain, at least temporarily, from packet switched voice service registration attempts with the cellular network based on the determination that the subscription of the UE device does not include packet switched voice service from the cellular network.

A method for managing a wireless user equipment device (UE), the method comprising:

• at the UE:
• providing a request relating to packet switched voice service to a cellular network entity associated with a cellular network;
• receiving a response comprising an invalid proxy call session control function (P-CSCF) address;
• recognizing that the invalid P-CSCF address is invalid;
• determining that the subscription of the UE does not include packet switched voice service from the cellular network based on the P-CSCF address being invalid;
• and
• refraining, at least temporarily, from packet switched voice service registration attempts with the cellular network based on the determination that the subscription of the UE device does not include packet switched voice service from the cellular network.