Processing an incoming request message and transmitting outgoing request messages to telephony devices located in various different geographic regions of a telephony system are provided. The telephony devices include at least one group of potential recipient telephony devices. A group of potential recipient devices include mobile telephony devices that can move between the various different geographic regions. An incoming request message comprising a telephony party identifier is received. The telephony party identifier is recognized as a telephony party identifier to be subject to location-based processing. A subgroup, including a plurality of potential recipient telephony devices currently within one or more target geographic regions associated with the recognized telephony party identifier, of the group of potential recipient telephony devices is determined. An outgoing request message is transmitted to each of a plurality of different telephony party identifiers, each being associated with a different potential recipient telephony device in the subgroup.