3Com NBX, Руководство по установке

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Using Auto Discover for Initial System Configuration 115
NBX System
Operating Modes
You can configure the NBX system to behave in one of the three
traditional telephone system modes:
■
Key mode – CO lines map to buttons on users’ telephones
To configure key mode behavior using the NBX NetSet utility, use
Button Mappings and the Auto Extension setting for each line card
port. Button Mappings enable you to map a line card port extension
to a specific Access button on a 3Com telephone. Button Mappings
identify the telephones that ring when a call comes in on the mapped
CO line. Auto Extension specifies the destination of a call that is not
answered at any of the telephones. The system must be using 3Com
call control mode because you cannot map telephone lines to phone
buttons if the NBX system is operating in SIP mode. See the
NBX
Administrator’s Guide for more information on SIP on the NBX.
■
PBX mode – CO lines are pooled and arbitrated by the NCP
The CO lines do not map to individual telephones. All incoming calls
go first to a receptionist’s telephone or the Automated Attendant. If
the call goes to a receptionist’s telephone, the receptionist forwards
the call to the user’s extension, or if the user is out of the office, the
call can be sent directly to the user’s voice mailbox. To call an outside
number, a user must dial the line pool access number, typically 9, and
the NCP assigns the next available line. PBX mode allows you to make
maximum use of a limited number of CO lines.
Direct Inward Dialing (DID) configuration requires changes to the system
dial plan. For more information on DID, see the
NBX Administrator’s
Guide .
■
Hybrid mode – Combines key mode and PBX mode
Some CO lines are mapped directly to telephones, while the rest are
pooled. The system must be using 3Com call control mode because
you cannot map telephone lines to phone buttons if the NBX system is
operating in SIP mode. See the
NBX Administrator’s Guide for more
information on SIP on the NBX.
Direct Inward Dialing (DID) configuration requires changes to the system
dial plan. For more information on DID, see the
NBX Administrator’s
Guide .
PBX mode is the easiest configuration to set up and manage. Key mode
requires more configuration because you must map the CO lines to
telephones.