Patent ID: 8064580
Filing Date: 2011-11-22
Classification: H04M

Abstract:
1. At a server in a packet network, a method for selectively establishing and monitoring a call between a calling party and a called party, the method comprising receiving a first message from said calling party including a request to establish a call to said called party, sending a second message to a first network address associated with said called party, said second message requesting evidence of the presence of said called party at said first network address, evaluating evidence of satisfying at least a first criterion in any response to said second message when said evidence in said any response to said second message satisfies at least said first criterion, establishing a conference call between said calling party and said first network address, and after said establishing a conference call between said calling party and said first network address, monitoring packets for evidence of the exclusive continued presence of said called party at said first network address to detect any attempted or actual addition of another party or substitution of another party for the called party.