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...

2006-01-17

2006-01-17

Perez-Gutierrez, Rafael (Department: 2686)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S560000, C455S565000, C370S351000, C370S465000, C370S522000

Reexamination Certificate

active

06987974

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.

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