B-8
Operator's Manual
Oper
ati
o
n
Your PBX gives you the option of speaking alternately to two parties. For alternation with two
external parties, you normally need the support of the exchange (alternation (HOLD) ISDN
feature). You can, however, also carry out alternation without the exchange, since the PBX
supports alternation via the second B channel.
From the query conversation to alternation:
Your PBX gives you the option of speaking to two parties at the same time. For a conference
with two external parties, you normally need the support of the exchange (three-party con-
ference call (3PTY) ISDN feature). To save the additional charges that may be involved, the
PBX supports conferences via the second B channel.
From the query conversation to the conference:
1. 6
Alternation (from a query conversation)
g
F
1
g
F
1
g
Query conversation
(no. 2)
[Omit with
pulse dialling]
Conversation
(No. 1)
[Omit with
pulse dialling]
Query conversation
(no. 2)
h
Transferring a call from the alternation status to a fourth party is not possible. You
must first end the conversation with one of the two calling partners.
Ending
씮
Same as query conversation: by punching in
F
8
or by one of the calling part-
ners replacing the handset. If you replace the handset, the other two parties are connected
(see ChapterTransferring a Conversation (from a Query Conversation) on page B-9 or
ChapterExternal call to external extension on page B-9).
1. 7
Conference (from query conversation)
g
F
6
g
Query conversation (no. 2)
[Omit with pulse dialling]
Conference
h
Transferring from a conference to a fourth party is not possible. You must first end
the conversation with one of the two calling partners.
Ending
씮
Same as query conversation: by one of the calling partners replacing the hand-
set. If you replace the handset, the other two parties are connected (see ChapterTransfer-
ring a Conversation (from a Query Conversation) on page B-9 or ChapterExternal call to
external extension on page B-9).
A conference is not possible with a door extension.
If a hands-free telephone set is involved in a conference with three internal extensions,
you may hear echoes or whistling in the line.
