Avaya IP Office 3.2 5601 - Manual (Page 13)

System Features
4601 and 5601 User Guide Page 9
IP Office 3.2 [15-601078] Issue [3] (1 June 2006)
Do Not Disturb
You may choose to receive no calls at all or only those from particular callers on your exceptions list:

To switch Do Not Disturb on (with or without exceptions), dial *08. To switch it off, dial *09.

To add a number to the exception list, dial *10*N#.

To delete a number from the exception list, dial *11*N#.
Note

Your callers, other than your exceptions, either hear busy tone or are re-directed to your voicemail.
Making Calls
To make internal calls:

Lift the handset and dial the number of the extension you require.
To make external calls:

Dial the number (prefixed by the access code if required).
If you hear a busy tone while dialling, then the call may be barred. Your system administrator can
bar certain calls, such as those to premium rate numbers and international calls