CPG
Call Progress
An ISUP (ISDN User Part) signalling message sent in either direction during the active or set-up phase of the call indicating that an event of significance has occurred eg. ringing call forwarded.
An ISUP (ISDN User Part) signalling message sent in either direction during the active or set-up phase of the call indicating that an event of significance has occurred eg. ringing call forwarded.
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