Praful B Shanghavi

US Patent:

50480812, Sep 10, 1991

Filed:

Dec 28, 1989

Appl. No.:

7/458070

Inventors:

George W. Gavaras - West Long Branch NJ
Albert S. Loots - Naperville IL
Praful B. Shanghavi - Edison NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H04M 706
H04Q 378
H04Q 1104

US Classification:

379221

Abstract:

In a telecommunication system having a plurality of cooperating exchanges and using a separate signaling network, an existing exchange is replaced by a new exchange by a piecemeal transferring of interexchange trunks from the existing exchange to the new exchange and testing the trunks on the new exchange. All signaling messages pertaining to trunks originally resident on the existing exchange are addressed to the existing exchange, are intercepted and are selectively forwarded to the new exchange on the basis of recorded data defining trunks moved to the new exchange. One embodiment uses a point code converter connected between a signal transfer access point for the signaling network and both the old and the new exchange. The converter receives all messages addressed to the existing exchange and transfers the messages to either the old or the new exchange, depending on the present location of the trunk. Messsages transmitted from the new exchange to other exchanges of the network are modified by inserting the identity of the old exchange as the source of the message.