ISUP
ISDN User Part
ISDN User Part is part of the SS7 (Signalling System No.7) protocol layer and used in the setting up management and release of trunks that carry voice and data between calling and called parties.
ISDN User Part is part of the SS7 (Signalling System No.7) protocol layer and used in the setting up management and release of trunks that carry voice and data between calling and called parties.
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