Patent · US Expired

ISDN call processing

US5420867A · kind A · utility

12Cited by

4References

8Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Steven Price · Albany, US
David J. White · Beecher, US
Barry J. Worley · Southampton, GB

Key dates

Filing date	Nov 23, 1993
Grant date	May 30, 1995
Priority date	—
Expiry date	Nov 23, 2013

Classification

Technology area (CPC H)Electricity
CPC primaryH04Q11/0457
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A first terminal makes a call over an ISDN link to a second terminal. Both terminals support a plurality of possible protocols to be used on the ISDN B channel. The calling terminal builds the protocol stack for the desired protocol prior to requesting the call from the network. When it is notified of the B channel selected, it can then attach the already formed protocol stack to the relevant B channel. Similarly, the called terminal starts to build the desired protocol stack immediately on receipt of the call. When the protocol stack is complete, is then accepts the call from the network, and can attach the protocol stack immediately to the relevant B channel.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.