Patent ID: 9432310
Filing Date: 2016-08-30
CPC Classification: H04L,H04W

Claim Text:
1. A method of operating a control node of a wireless communication system, where a wireless communication device is initially configured to use circuit switch fallback (CSFB) services over a first wireless communication network, the method comprising: detecting CSFB failure by at least monitoring performance of a CSBF link between the first wireless communication network and a second wireless communication network that routes voice call signaling over the CSBF link for the wireless communication device; responsive to the CSFB failure, informing at least the wireless communication device of the CSFB failure, informing a home location register (HLR) in the second wireless communication network of the CSFB failure, and informing the HLR to process incoming voice calls with a treatment service having a voicemail timeout delay; and responsive to the CSFB failure, routing further incoming voice call signaling for the wireless communication device using the second wireless communication network instead of the CSFB link.