Patent ID: 9538574
Date: 2017-01-03
CPC Classifications: H04W

Claim:
1. A method of controlling set up of a terminating call to a User Equipment, UE, in a Circuit Switched Fallback, CSFB, situation involving a first Mobile Switching Center, MSC, paging the UE and a second MSC where the UE is performing a Location Update, the method being performed by the first MSC and comprising: receiving, from a Home Location Register, HLR, a Provide Roaming Number, PRN, message; receiving, from a Gateway MSC, GMSC, a call set up request message; receiving a notification message from the second MSC, the notification message triggering an enhanced Roaming Retry procedure to the first MSC; forwarding information received in the PRN message towards the second MSC; and forwarding the call set up request message towards the second MSC.