When connected to a T1 ISDN line from a PBX, how can the on-hoof/off-hook status be monitored on a CDP/CVM?

A.
Use the dspsig command

B.
Use of the dspconst command

C.
Use of the dspcln command

D.
It is not possible to observe the on-hook/off-hook for this configuration.

Explanation:
ISDN voice circuits normally use CCS(Common Channel Signaling) for signaling as oppsed to CAS(Channel Associated Signaling). CCS circuits do not allow for individual timeslot or signaling state monitoring using the dspconst or dspsig commands on the IGX.