Method and apparatus for establishing an ISDN call between parti

Details Method and apparatus for establishing an ISDN call between parti Method and apparatus for establishing an ISDN call between parti

1997-01-29

1999-08-24

Wolinsky, Scott

Telephonic communications

Plural exchange network or interconnection

With interexchange network routing

379201, 379230, H04M 342

Patent

active

059434120

ABSTRACT:
In a switched telecommunication network (PSTN or ISDN) between a calling party connected to an ISDN switched digital network and a destination called party whose call number is written "Z", the number "Z" of the destination called party is automatically replaced by a number "Y" for an intermediate site which is connected to the ISDN, and the number "Z" of the destination called party is conveyed to the intermediate site, via the ISDN D channel. This substitution process is extended to interconnections between competing ISDN networks and creates a new kind of signaling for use between public exchanges, intermediate between protocol D and ITU-T semaphore channel number 7.

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