Patent ID: 8160228

Claim:
A method comprising: receiving, at a private branch exchange, a first precursor call from a telephone number T to a telephone number D; allocating, by an application server, from a pool of ports at the private branch exchange, a port P that is capable of emulating a telephone extension, wherein the extension is known only to the application server and to the private branch exchange; and establishing a resultant call between the telephone number T and a telephone number C, the resultant call being based on at least one precursor call having been made that includes the port P; wherein establishing the resultant call comprises: (1) establishing a second precursor call from the port P to the telephone number D; and (2) establishing a third precursor call from the telephone number D to the port P; wherein the telephone number C is associated with the telephone number D in a data structure; and wherein the telephone number D is within an address space of a private branch exchange.