Aiphone MASTER STATION AI-MS900 - Manual (Page 9)

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Step 3. The call tone stops and conversation can
proceed when the called party answers.
Step 4. To terminate the conversation, replace the
handset or press the [C] key.
8.3. Being Called
Step 1. A trill call tone is heard.
Step 2. Lifting the handset stops the call tone and
permits conversation to proceed. (A response
can also be made by pressing the [PTT] key for
handsfree conversation.)
[Response with the [PTT] key]
(1) Simultaneous conversation is possible if the
calling party is speaking with the master
station handset lifted.
(2) "Press-to-talk" alternate conversation is
possible if the calling party is speaking with
the master station handset on-hook.
Refer to "7.4. Conversation Method" on the next
page.
Step 3. To terminate the conversation, replace the
handset or press the [C] key.
or
C
Call tone
or
PTT
or
C