Patent ID: 8611525
Filing Date: 2013-12-17
Classification: H04M

Abstract:
1. A method to cancel a blindly-transferred call in Session Initiation Protocol (SIP), comprising: receiving, at a call center, a call request from an endpoint over a media path between the call center and the endpoint; closing the media path between the call center and the endpoint by communicating a hold message from the call center to a SIP enabled Private Branch eXchange (PBX); initiating a first blind transfer of the call request from the call center to a first call agent by communicating a SIP refer message to the SIP enabled PBX; determining that the first call agent is unavailable to handle the call request; canceling, by a processor, the first blind transfer of the call request initiated by the SIP refer message by transmitting a resume relnvite message from the call center to the SIP enabled PBX to re-establish the media path from the call center to the endpoint for the call request; initiating a second blind transfer of the call request from the call center to a second call agent by communicating the SIP refer message to the SIP enabled PBX; receiving notification from the SIP enabled PBX that the second blind transfer of the call request from the call center to the second call agent was successful; and communicating a SIP bye message from the call center to the SIP enabled PBX to disconnect the call center from the call request.