Patent ID: 7995560
Filing Date: 2011-08-09
Classification: H04L,H04M

Abstract:
1. A communications system comprising: a plurality of Session Initiation Protocol (SIP) endpoints connected to a SIP network; at least one first keyset for a first SIP endpoint of the plurality of SIP endpoints, the at least one first keyset having multiple lines available for establishing connections to the first SIP endpoint, the multiple lines comprising a primary line and at least one secondary line; a Back to Back User Agent (B2BUA) managing communications with the plurality of SIP endpoints; a media negotiator connected to the B2BUA, the media negotiator negotiating media with the plurality of SIP endpoints responsive to an indication of a pending call; wherein the at least one first keyset registers with the B2BUA such that only the primary line of the at least one first keyset registers with the B2BUA via a registration message, the registration message comprising address information for the at least one secondary line, the at least one secondary line not registering with the B2BUA; wherein the B2BUA forwards the address information of the at least one secondary line to the media negotiator; wherein the B2BUA manages calls to the at least one first keyset after the at least one first keyset registers with the B2BUA; a gateway server connecting the B2BUA to a public switched telephone network or public land mobile network, the gateway server receiving an incoming call and responding by sending an invite message comprising calling party number information, address information for the gateway server, a called party number, and a media type to the B2BUA, the media negotiator determining a common media for all devices to be alerted regarding the incoming call, and the B2BUA forwarding the invite message to each registered primary line of the at least one first keyset; and wherein the at least one first keyset is comprised of a plurality of first keysets and wherein one of the first keysets responds to the invite message forwarded by the B2BUA via a notify message for receiving the incoming call and wherein the B2BUA sends a notify message to the other first keysets that the incoming call has been connected and wherein each of the notify messages uses less resources than the invite message.