Methods for routing a call to a mobile unit that has been ported

摘要

The present invention provides a method for determining the HLR for a user who has been ported in to an IMS network. A call request is received for a mobile unit that has been ported. The communication system determines a Home Location Register (HLR) for the mobile unit. The communication system receives a temporary directory number associated with the mobile unit. The call request is completed to the mobile unit using the temporary directory number.