1. Lift the receiver or press
2. Press
Result:
The Intercom green light comes on and the 5ESS dials the intercom call.
One-digit Dial Intercom
One-digit Dial Intercom service includes up to ten parties. The intercom destinations are assigned code numbers 0 (zero) through 9.
1. Lift the receiver or press
2. Press
Result:
The Intercom green light comes on.
3. Enter the one-digit code of the desired party.
Result:
Your intercom call is placed.
Two-digit Intercom
Two-digit Dial Intercom service includes up to ninety-nine parties. The intercom destinations are assigned code numbers 01 through
99.
1. Lift the receiver or press
2. Press
Result:
The Intercom green light comes on and you hear a stutter dial tone.
3. Press
and enter the two-digit intercom code of the desired party.
Result:
Your intercom call is placed.
Receiving Intercom Calls
A single, steady beep is the signal for an incoming intercom call. For Automatic and One-digit Dial Intercoms, the green light flashes on
5ESS Digital (ISDN) Telephone User Guide | IS&T
https://ist.mit.edu/services/telephony/isdnguide
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