Nortel Meridian 1 Administration And Maintenance page 110

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Chapter 2 — Feature descriptions
553-3011-311 Standard 7.0
Multi-Party Operations
Call Join
The Call Join feature allows a controlling party to conference-in or transfer
an active party to a held party. The controlling party can then hang up. The
controlling party's terminal must be equipped with a Conference 3/6 key, and
at least one secondary DN or Call Waiting key.
ISDN BRI terminals cannot be the controlling party. If the ISDN BRI
terminal is the active party or held party, the Call Join feature is supported as
described; however, the ISDN BRI terminal display is not updated.
Three-Party Service
The Three Party Service feature allows a user of a 500/2500 terminal with
Three Party Service Allowed (TSA) COS to toggle between an active party
and a held party on an ISDN BRI terminal, through the use of the Call Hold
feature. However, a three party conference cannot be formed.
AN ISDN BRI terminal may be placed on hold or placed in a three party
conference by a controlling terminal that is a non-ISDN BRI terminal;
however, the ISDN BRI terminal display is not updated.
Conference 6
The Conference 6 feature is an extension of Three-party service, allowing
users of 500/2500 telephones, with TSA and C6A COS, the added capability
of establishing a conference of up to six parties.
AN ISDN BRI terminal may be placed in a six party conference by a
controlling terminal that is a non-ISDN BRI terminal; however, the ISDN
BRI terminal display is not updated.
Recovery of Misoperation on Call Transfer
The Recovery of Misoperation of Call Transfer feature prevents external calls
from being dropped due to misoperation of the Call Transfer feature.
Optional treatments of a misoperation may be configured on a customer basis.
May 1999