Feature (While busy, DND or call tone is heard) Default
Joining an Existing Call (Executive Busy Override)
3
Leaving a Message Waiting Indication/Calling Back the Caller Who Left
an Indication (Message Waiting)
4
Monitoring Another Extension (Call Monitor)
5
Reserving a Busy Line (Automatic Callback Busy)/ Setting Call-
back on an ISDN Line (Completion of Calls to Busy Subscriber [CCBS])
6
1.2.6 Alternating the Calling Method (Alternate Calling—Ring/Voice)
Feature (While dialling or talking) Fixed Number
1.4.5 Multiple Party Conversation
Adding Other Parties during a Conversation (Conference)
3
1.9.1 If a Doorphone/Door Opener is Connected
From any extension while talking to the doorphone 5
User Manual 215
4.2.1 Feature Number Table
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