Abstract: A bridge connection is made between the interfaces on physically distinct telecommunication servers such that the two ends of the bridge can be used to connect existing calls that are terminated on each of the servers. To provide the bridge connection, a call using a standard outgoing PRI trunk on one of the servers is made through the public switched telephone network (PSTN) to an incoming PRI trunk on the other server. When a bridge connection is required one of the servers is queried for its directory number, which is any number that the PSTN has assigned to equipment in that server. The other server is then instructed to make a call to that number. When the called server recognizes the incoming call as bridge connection, its answers the call. The calling server then associates the bridge connection with the pending action, using information encoded in the out-of-band signal with which the call between the servers was established.