Patent ID: 6625170
Filing Date: 2003-09-23
Classification: H04L,H04M,H04Q

Abstract:
A method of setting up a call between a first terminal coupled by a local link to a program controlled switching system in a first switched telecommunications network and a second terminal coupled by a local link to a program controlled switching system in a second switched telecommunications network, comprising the steps of:detecting dialing of a number by the first terminal; in response to the detection, creating a first signaling packet identifying the dialed number, the first signaling packet being in an interoffice signaling protocol of the first switched telecommunications network; transmitting the first signaling packet to a first interface to an internetwork separate from the first and second switched telecommunications networks; encapsulating the first signaling packet in a packet of a second protocol compatible with the internetwork; transmitting the packet of the second protocol via the internetwork to a second interface between the internetwork and the second switched telecommunications network; transmitting the signaling packet from the second interface to a node of the second switched telecommunications network; based on information in the node of the second switched telecommunications network deciding to proceed with call processing; based on the decision, creating a second signaling packet in an interoffice signaling protocol of the second switched telecommunications network; transmitting the second signaling packet to the second interface to the internetwork; encapsulating the second signaling packet in another packet of the second protocol compatible with the internetwork; transmitting said another packet of the second protocol via the internetwork to the first responsive to the receipt of said another packet of the second protocol in the first switched telecommunications network, establishing a communication path between the first and second terminals.