Patent ID: 7653046

Claim:
A method for providing a plurality of separate Voice Over Internet Protocol (VOIP) call sessions for a single North American Numbering Plan (NANP) Directory Number (DN) comprising: associating a plurality of IP addresses with a single NANP DN in a lookup table, wherein each IP address corresponds to a different VOIP terminal and all of the VOIP terminals having the same DN for communicating with the PSTN; a switching center receiving an incoming call from a calling party calling to the NANP DN; the switching center determining that an existing VOIP call session associated with the NANP DN is in progress; the switching center identifying another IP address associated with the NANP DN in the lookup table not being used in an existing VOIP call session as an idle IP address; routing the incoming call over an IP network between the calling party and a called party VOIP terminal having the idle IP address.