Patent ID: 8462772

Claim:
A method, comprising: receiving an incoming call from a calling party for a plurality of members of a group at an SIP server; transmitting, from the SIP server, an invite message to the plurality of members, wherein the invite message comprises one or more addresses that specifies each of the members of the group; identifying an acceptance of the invite message by at least one accepting member of the plurality of members; transmitting, from the SIP server, a cancel message to at least one member of the plurality of members, wherein the cancel message is sent after the identified acceptance; establishing a SIP-based active dialog between the calling party and the at least one member; recognizing a reverting call; identifying when a reverting call originator goes on-hook; alerting one or more members of the group; identifying when the one or more devices goes off-hook; and providing a reverting call emulation service when establishing the SIP-based active dialog.