AT&T System 25 - Manual (Page 63)

Speakerphone
If you have a Built-In-Speakerphone (BIS) telephone or multiline
telephone with a Hands-Free Unit (HFU), you can use the
Placing Calls
The light next to Speakerphone turns on to indicate that you can listen,
and the light next to Microphone turns on, indicating that you can be
heard on the other end.
2 When the other person answers, begin talking.
NOTE: If you want to temporarily keep the other person .
The light next to this button turns on again.
Answering Calls
1
2
The light next to Speakerphone turns on to
and the light next to Microphone turns on,
heard by the caller.
Begin talking.
NOTE: If you want to temporarily
hearing you, press
The light next to this button goes off.
indicate that you can listen,
indicating that you can be
keep the caller from
When you want to resume your conversation with the caller,
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