Patent · US Expired

Method for establishing a call in the presence of outband indication of PSTN involvement at multimedia call setup

US6987974B1 · kind B1 · utility

13Cited by

13References

4Claims

0Family size

Assignee

Nokia · FI

Inventors

Miraj Mostafa · Tampere, FI
Harri Honko · Tampere, FI

Key dates

Filing date	Nov 17, 2000
Grant date	Jan 17, 2006
Priority date	—
Expiry date	Jan 3, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH04Q2213/13251
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

Forward/Backward Call Indicators and the Progress Indicator (PI) of ISUP messages are used in call control signals, such as for setting up a mobile multimedia call, to indicate the involvement of a Public Switched Telephone Network (PSTN) terminal. Either terminal of an end-to-end connection can initiate the call and likewise either can respond to the call control signals initiated by the other terminal to immediately recognize the unambiguous fact that a PSTN terminal is involved in the call and to immediately respond by correctly setting up an appropriate and compatible communication format.

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