Patent ID: 8831602

Claim:
A method, comprising: receiving a call, at a first mobile switching center (MSC) associated with a first network, wherein the call is intended for a subscriber of services associated with a second network; sending a first location request message to a home location register (HLR) to request location information associated with a mobile device to which the call is directed; receiving, by the first MSC, an address associated with a service control point (SCP); determining, by the SCP, that the second network is experiencing an outage or a problem; determining, by the SCP, whether the mobile device is registered with the first network; and forwarding the call via the first network, in response to determining that the mobile device is registered with the first network, wherein the forwarding comprises: transmitting, by the SCP, a second location request message to the HLR, transmitting, by the HLR, a mobile directory number associated with the mobile device to a serving MSC, and assigning, by the serving MSC, a temporary line directory number (TLDN) to the mobile device.