AT&T SYSTEM 25 Manual page 30

The Conferencing feature allows up to five parties, including the the conference originator, to
participate in a conference call. Any type of voice terminal can use the Conferencing feature.
A conference can include up to two outside parties (trunk calls). An attempt, by any
conferee, to add a third outside party or sixth party of any type will be denied.
A single-line voice terminal can set up a conference between three parties; any of the
conferees who are System 25 users may then add other parties to the conference to reach
the five-party maximum.
A call receiving special ringback (Call Waiting) can be part of a conference, unless a queued
call (Callback Request) is already part of the conference. Either a queued call or a waiting
call counts as two conferees until the call is completed; when completed it counts as one
conferee.
A ringing line can be added to a conference and counts as one of the conferees.
Exclusion may be invoked before establishing a conference. If it is invoked after the
conference is established, all internal conferees will be dropped except for the party that
invoked Exclusion.
Multiline
Setting Up a Conference
1
Dial the first party.
2
Announce the conference call.
Press
3
The light next to the button of the held callwinks intermittently.
4
Dial the next party or press the line button for that party.
NOTE:
(busy, no answer, or misdial), you should do the following:
a Press the switchhook and then release.
b If you are reconnected to the first party, return to Step 3 and continue.
5
Announce the conference call.
6 Press the button next to the winking light to join the conference parties
together.
7
If you want to add additional conferees, return to Step 3 and continue.
Conferencing
and listen for dial tone.
[ ]
C O N F E R E N C E
If, for any reason, this call should not be added to the conference
Otherwise, return to Step 4 and continue.
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Conferencing