Patent ID: 8064892
Filing Date: 2011-11-22
Classification: H01Q

Abstract:
1. A method comprising: a network switch detecting transition of a landline telephone from an on-hook state to an off-hook state at a time when a call alert signal is not being sent to the landline telephone; ascertaining by querying subscription data that the landline telephone subscribes to a cellular-landline conference call service, wherein the subscription data is in a subscription database; responsive to the detecting and the ascertaining, determining whether the cellular telephone is currently engaged in a call, wherein determining whether the cellular telephone is currently engaged in a call comprises querying a call-state database, which indicates call state of one or more telephone devices, to determine call state of the cellular telephone; and responsive to the determination being that the cellular telephone is currently engaged in a call, engaging in a process to conference the landline telephone into the call; the method further comprising determining from subscription data that the landline telephone is associated with the cellular telephone.