Vodafone Intellectual Property Licensing Limited

Ratna Ganeshanandan

Christopher Pudney

David Andrew Fox

In a mobile telecommunications network including at least a first type of radio access network and a second type of radio access network and a mobile terminal, a method of establishing a voice communication with the mobile terminal including: receiving a voice communication request in relation to the mobile terminal on the second radio access network type; determining a parameter associated with a terminal characteristic; and using the parameter to determine whether to establish the voice communication on the first type of radio access network or maintain the voice communication on the second type of radio access network. Preferably the determined parameter is a parameter relating to a terminal type for the mobile terminal, and is determined from the terminal's IMEI.

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Newbury, United Kingdom

Ratna Ganeshanandan