Patent ID: 8040877
Filing Date: 2011-10-18
Classification: H04L,H04M,H04Q

Abstract:
1. A system comprising: an access switch configured to operate at an edge of a Voice over Internet Protocol (VoIP) network, the access switch configured to perform packet switching, the access switch terminating an access device and connecting the access device to the VoIP network, wherein all session state associated with a call from the access device is maintained in the access switch from call setup until call tear-down, the session state comprising call state information and call control information for the call; and a signaling gateway configured to connect the VoIP network and a non-IP network, wherein only transaction state associated with the call and not the session state is maintained in the signaling gateway; wherein transaction state for a transaction associated with the call is maintained in the signaling gateway only during pendency of the transaction, wherein the pendency of the transaction is less than pendency of the call.