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During the call, the called party can press the HFAI/Mic or MICROPHONE
button to mute the microphone temporarily and prevent the caller from
hearing. Pressing the button again turns the microphone on again.
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The HFAI/BIS user may press the SPEAKER (HFAI set) or the
SPEAKERPHONE (BIS set) button to end the call. For V2 systems only: if
the calling party hangs up first, this is not necessary.
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If only the AUTO ANS LED is on:
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The set generates a tone burst over its speaker to indicate an incoming call
(the calling party also hears this tone).
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The set’s speaker turns on and the set “answers” the call.
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Call setup is complete.
However, the called party can hear, but not respond
to, the calling party. To respond, the user must lift the handset or press the
HFAI/Mic button on an HFAI set or press the MICROPHONE button on a
BIS set.
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The HFAI/BIS user may press
the SPEAKER (HFAI set) or the
SPEAKERPHONE (BIS set) button to end the call. For V2 systems only: if
the calling party hangs up first, this is not necessary.
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If only the HFAI LED (or neither LED) is on:
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The HFAI feature is disabled. The call answering procedure is the same as
for a standard MERLIN set.
If, during an HFAI call, the user decides to pick up the handset, the HFAI/Mic or HFAI
LED will turn off. On an HFAI set, the user is not permitted to revert to hands-free
operation. (Pressing the HFAI button while using the handset will simply disable the HFAI
feature for subsequent calls.) A BIS set user may transfer a call from the handset to the
speakerphone by pressing the SPEAKERPHONE button and hanging up.
Voice Terminals with HFUs
These sets do not have an HFAI button. To turn on the HFAI feature the user simply
presses the AUTO ANS button; the green status LED lights.
After HFAI is activated, operation is exactly the same as for the BIS set except that the
SPEAKERPHONE and MICROPHONE buttons and LEDs are on the HFU.
Voice Terminals without HFUs
The HFAI feature is activated by pressing the AUTO ANS button. A beep signal announces
an incoming call and the SPEAKER LED lights. A one-way talking link is established from
the caller to the terminal; the user can hear the caller but cannot converse. Lifting the
handset connects the user to the caller.
Considerations
The user of a HFAI equipped station should always deactivate the HFAI feature when
leaving the work area.
If this is not done, incoming calls will be “answered”, but the callers
will be talking to an unattended position.
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