Patent ID: 8611880

Claim:
A method of routing a call made to a fixed telephone number of a UMA-subscriber having at least one of a GSM/UMA subscription and a UMTS/UMA subscription, in a mobile telecommunications network comprising a first switching node and a service control entity, said method comprising: associating a Location Area Code (LAC) or a combination of a LAC and cell identifier (CI) with each Generic Access Network Controller (GANC) of a group of GANCs; receiving, by said service control entity, a trigger message sent by said first switching node, said trigger message including said fixed number of said UMA-subscriber; upon receiving a trigger message, acquiring location information of said UMA-subscriber either by said service control entity or by said first switching node, said location information comprising at least one of a LAC, and a combination of LAC and cell identifier (LAC+CI) associated with a serving BSC or one of said GANCs serving said UMA-subscriber; and sending a connect message from the service control entity to the first switching node to connect the call to said UMA-subscriber when said LAC or said combination LAC+CI is associated with one of said group of GANCs.