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Additional
Release (ISUP)
English Wikipedia - The Free Encyclopedia
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ISDN User Part
The
ISDN (Integrated Services Digital Network) User Part
or
ISUP
is part of the
Signaling System No. 7
(SS7) which is used to set up
telephone calls
in the
public switched telephone network
(PSTN). It is specified by the
ITU-T
as part of the Q.76x series.
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