Patent ID: 9699718
Date: 2017-07-04
CPC Classifications: H04W

Claim:
1. A method for wireless communications, comprising: determining a multi-mode device that has camped on a packet switched radio access technology (RAT) network is capable of supporting a voice service; determining an attach type from a plurality of attach types based on first parameters of a home network and voice service capability; selecting a first domain from a first plurality of domains for the voice service over the packet switched RAT network utilizing the attach type and one or more second parameters, wherein the first plurality of domains comprise single carrier-circuit switched fall back (1xCSFB) domain; and if the multi-mode device is capable of supporting short message service (SMS), selecting, from a second plurality of domains, a second domain for SMS over the packet switched RAT network utilizing the one or more second parameters and registration information about the selected first domain.