Patent ID: 8798660

Claim:
A method of processing an incoming request message and transmitting outgoing request messages to telephony devices located in various different geographic regions of a telephony system, the telephony devices in the telephony system including at least one group of potential recipient telephony devices, a said group of potential recipient devices including mobile telephony devices that can move between said various different geographic regions, the method comprising: receiving an incoming request message, the incoming request message comprising a telephony party identifier; recognising said telephony party identifier as a telephony party identifier to be subject to location-based processing; determining a subgroup of said group of potential recipient telephony devices, said subgroup including a plurality of potential recipient telephony devices currently within one or more target geographic regions associated with the recognised telephony party identifier; transmitting an outgoing request message to each of a plurality of different telephony party identifiers associated with the plurality of potential recipient telephony devices in said subgroup, said plurality of different telephony party identifiers each being associated with a different potential recipient telephony device in said subgroup; transmitting outgoing request messages originating from telephony devices in said group; and setting the telephony party identifier, which is subject to location-based processing for an incoming request message, as an originating telephony party identifier for an outgoing request message when the associated device is in the one or more target geographic regions.