When the Branch Gateway is in survivable mode, contact closure works as follows:
Procedure
Lift the phone receiver and listen for the survivability dial tone.
Dial the appropriate contact closure FAC (Feature Access Code) — open, close, or pulse — on the phone.
If you dial an invalid FAC code, then SLS plays an intercept tone and terminates the session.
If you dial a valid FAC code, then you will hear a standard dial tone and can proceed to Step 3.
Dial the three-digit Branch Gateway number.
If you enter fewer than three digits, then SLS times out and you must restart this procedure from the beginning.
If the Branch Gateway number matches the local Branch Gateway number, then SLS plays a standard dial tone and you can proceed to Step 4.
If the Branch Gateway number does not match the local Branch Gateway number, SLS plays an intercept tone and terminates the session.
Dial the contact closure code, for example 1 for contact pair #1, and 2 for contact pair #2.
You hear stutter tone and then silence, confirming these valid codes. If you dial an invalid contact closure number, you hear an intercept tone.
Contact closure feature activations appear in the CDR log.
Note:
If the contact closures are set to manual operation, the FAC operation will not work even though the confirmation tone is heard. However, an event will be logged.
