A method and apparatus for user location registration comprising determining, by a first network service provided by a first network, subscriber location information associated with a first user communication device registered with the first network, wherein the subscriber location information includes a network identifier of the first device, and wherein the network identifier is not obtained via session initiation protocol (SIP) messaging received from the first device; receiving, by the first network service, a broadcast location request for the subscriber location information in response to a call initiated from a second user communication device wherein receiving the broadcast location request further includes determining subscriber identity information from the broadcast location request, and determining that the subscriber identity information is associated with the subscriber location information; and sending, by the first network service, the determined subscriber location information in response to the broadcast location request.