A system, apparatus and method are provided for subscriber control of timed
and regional membership in multiple member termination groups for multiple
leg telecommunication sessions, such as for providing outgoing call legs
for a flexible alerting service, to different groups of members, at
different times of day or different geographic locations. The preferred
system includes a home location register coupled to a mobile switching
center. The home location register has, stored in a memory, a plurality of
secondary directory numbers associated with a primary directory number,
and includes instructions to determine whether each secondary directory
number, of the plurality of secondary directory numbers, is currently
incorporated within a selected alerting group based upon a predefined time
period parameter or a geographic location parameter for a mobile unit
corresponding to the secondary directory number. The mobile switching
center has an interface for receiving an incoming call leg designating the
primary directory number and for differentially processing and routing
each outgoing call leg associated with each secondary directory number
currently incorporated within the selected alerting group.
