Patent ID: 7983201

Claim:
A method comprising: transmitting, by a first telecommunications endpoint to a first server, a first request to establish a first telecommunications session, wherein the first request comprises: i) a first identifier of the first telecommunications endpoint, and ii) a second identifier of a second telecommunications endpoint, transmitting, by the first telecommunications endpoint to the first server, a second request to be notified of the first telecommunications session after transmitting the first request; receiving, by the first telecommunications endpoint from a second server, a first notification in response to transmitting the second request, wherein: i) the first telecommunications endpoint receives the first notification based on the fact that the first telecommunications endpoint is registered with the first server, and ii) the second telecommunications endpoint receives a second notification that is different from the first notification based on the fact that the second telecommunications endpoint is not registered with the first server; and transmitting, by the first telecommunications endpoint to the first server, a third request to connect to the first telecommunications session after receiving the first notification; wherein the second server transmits the second notification to the second telecommunications endpoint in response to the first server identifying that the second telecommunications endpoint is incapable of subscribing to the first server; and wherein the second server transmits the second notification to the second telecommunications endpoint based on a rule specified by a user of the second telecommunications endpoint.