Patent ID: 8849279

Claim:
A method of handling a circuit-switched or packet-switched call in a femtocell basestation, the method comprising: receiving, at the femtocell basestation, a message from a user equipment device in a protocol of the Non-Access Stratum, intended for a Mobile Switching Centre or a SGSN or GGSN in a core network of a telecommunications network; terminating the message in the protocol of the Non-Access Stratum; and performing local call control based on the message, wherein the step of performing local call control comprises: having terminated the message in the protocol of the Non-Access Stratum, obtaining an IMSI of the user equipment device; determining whether the user equipment device is allowed to register with the femtocell basestation; and if the user equipment device is not allowed to register with the femtocell basestation, terminating a registration attempt.