AGFEO basic-line plus AS 140 Operation And Program Manual page 117

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Conference circuit in the telephone
system
An external or door call is signalled to the
conference with the call waiting announce-
ment (knocking) tone if the called party is in
the conference.
Only the conference leader can pick up a
call by pressing the "brokering" key and
selecting the call with the "next" key. The
other conference members are on hold, but
the conference is terminated. After the
conference leader finished the inquiry call by
"esc", he can add the members on hold by
"brokering" and "conference" key.
A party is switched out of the conference if
he replaces the receiver. He can only be
fetched back into the conference by the
conference leader.
The conference is ended when the confer-
ence leader replaces the receiver.
Operation - System Telephones
Conference circuit in the ISDN exchange
Call charges are incurred for every external
call that participates in the three-party
conference.
It is not possible to place a call on hold in
the exchange if you hear the error tone
instead of the external dial tone. You are
connected back to the external subscriber
after pressing the "esc" key.
The three-party conference is not possible if
you hear the error tone after pressing the
"conference" key. You are connected back
to the second external subscriber after
pressing the "esc" key.
Press the "conference" key if you wish to
clear an existing ISDN three-party confer-
ence. You are connected to the party that
you last dialled into the conference . The
first party is placed on hold.
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