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SERVICE: SERVICE covers transmission of voice or non-voice message inclusive of ISDN (Integrated Services Digital Network) facilities over LICENSEE'S PSTN (Public Switched ... SERVICE: SERVICE covers transmission of voice or non-voice message inclusive of ISDN (Integrated Services Digital Network) facilities over LICENSEE'S PSTN (Public Switched

about the purpose of these numbers. We may recall that these were ISDN PRI numbers. 5 An ISDN-PRI can carry 30 voice ... also be used to carry voice. It is well known that ISDN-PRIs are frequently used for connecting private branch exchanges to the public network

services they provide."10 There are protocols like ISUP (ISDN user part), SCCP (Signaling Connection Control Part), etc. "ISUP is the protocol used