AEG Voxtel S100 User Manual page 17

Note:
If there is an external call while you are on an intercom call, you'll hear
warning beeps, and will have to end the intercom call before you can
answer the external call.
7.12.2 Call all handsets
In idle mode, press
display.
Press 9 to ring to all registered handsets.
7.12.3 Transfer an external call to another handset
During an external call:
Press and
OK
Press to show all the other registered handset numbers, plus "9".
Enter the number for the handset you want to transfer the call to.
>The external call is put on hold automatically and the called handset
rings.
Press on the called handset to establish an internal call.
Press on the calling handset or put the calling handset on the
charging cradle to end the current call with the external party.
The external call is transferred to the called handset.
Note:
If the other handset has not answered the intercom call, you can stop the
intercom and return to the external call by pressing
>If the other handset does not answer the intercom call within 30
seconds, the intercom will stop and you will return to the external call
automatically.
7.12.4 Make a 3-way conference call
The conference call feature allows one external call to be shared with two
handsets (in intercom). The three parties can share the conversation and
no additional network subscription is required.
During an external call:
Follow steps 1 to 4 in section "7.12.3 Transfer an external call to another
handset".
and the registered handset numbers will
/ to select "INTERCOM".
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at any time.