Patent ID: 8593939
Filing Date: 2013-11-26
Classification: H04L

Abstract:
1. A method for maintaining active calls during a failover in a communication network, comprising: suspending, by a processor of an active network element, all of the active calls between a plurality of calling endpoints and a plurality of called endpoints in the active network element where the active calls are placed in a suspended active state; transferring, by the processor of the active network element, call states of the active calls in the suspended active state in the active network element to a standby network element when the failover relates to the active network element; and switching over, by the processor of the active network element, the active calls in the suspended active state to the standby network element by activating the transferred call states of the active calls in the suspended active state where the active calls are supported by the standby network element between the plurality of calling endpoints and the plurality of called endpoints, wherein the active network element comprises an active border element and the standby network element comprises a standby border element, wherein if the transferring and the switching fail to complete within a pre-specified period of time, the active calls are dropped.