In which of the following conditions may call barring occur? (Multiple Choice)
eSpace IP phones support the () function that can provide the PC port link for the PC connection.
A () network is suitable for an enterprise with no more than 20,000 users that does not have branches or has branches that do not require bcal regeneration.
In the U1900 connecting to PSTN with the El trunk, the Tx and Rx indicators are off but the call service still fails. To locate the fault, which of the following operations are required? (Multiple Choice)