Go back to 350-030 - CCIE Voice Written Exam

Question :-

What statement is an attribute of ISDN Non-Facility Associated Signaling (NFAS)?
Single D-channel controls B-channels on the same T1 span, as well on other T1-spans.
Single T1 span can be split into two "trunk groups", each with its own dedicated D-channel.
Is available on both T1 and E1 PRIs.
Enables the D-channel to transmit "data" information unrelated to any voice call, such as inter-switch status updates.
Applicable to voice calls on PRI only, but not to data PRI calls.

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