Method for establishing a call in the presence of outband...

Details Method for establishing a call in the presence of outband... Method for establishing a call in the presence of outband...

H - Electricity

04

Q

H04Q 7/38 (2006.01) H04Q 7/24 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2290069

Forward/Beckward 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 en 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.

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