The number of messages required in networks where both location and
presence services are deployed may be reduced, by retrieving presence
data from messages otherwise intended to provide only location
information. Thus, information determined in a location service scheme is
utilized to provide a presence service as well. A location server
requests mobile subscriber (MS) information from a Core Network (CN) Node
(i.e. HLR, MSC, etc.) that can be used in determining the Location of the
MS. A single message aggregates retrieval of information for two
services, specifically, for both location and presence.