Patent ID: 6577867
Filing Date: 2003-06-10
Classification: H04W

Abstract:
A method supporting a handoff back call connection operation within a telecommunications network including a Mobile Station (MS) served by a Serving Mobile Switching Center (SMSC) connected along a call path to a Tandem MSC (TMSC) and an Anchor Mobile Switching Center (AMSC), wherein the AMSC is connected to the TMSC by a first inter-MSC trunk and the TMSC is connected to the SMSC by a second inter-MSC trunk, wherein the AMSC includes a designated channel, and wherein the handoff back call connection operation occurs from the SMSC to the AMSC, comprising the steps of:receiving at the SMSC a message including a BillingID parameter containing an identification number for the AMSC; determining by the SMSC that the handoff back call connection operation to a Target MSC should occur; determining from the identification number for the AMSC that the target MSC is the AMSC; verifying that the designated channel of the AMSC is available to support the MS; and moving the MS to the designated channel of the MSC by using a handoff back command addressed to the identification number for the AMSC.