Modes Of Operation; Host-Controlled Modes; Online Mode; Offline Mode - Nortel Digital Telephone IP Adapter Installation And Administration Manual

Using the digital telephone

Modes of operation

Digital telephones at your Digital Telephone IP Adapter unit site can operate in
the following modes:
host-controlled
online to host PBX
offline from host PBX

Host-controlled modes

Host-controlled mode means that the host PBX controls the following:
some display messages that display on your telephone
indicator updates such as the message waiting indicator
calls that you receive from or place to someone at the host PBX site
In host-controlled mode, a voice path is established to the host PBX and
signaling messages are passed between the host PBX and the Digital Telephone
IP Adapter unit.

Online mode

When in online mode, calls initiated on the host calling key are directed through
the host PBX. The display on your digital telephone set shows Online Mode.

Offline mode

When in offline mode, you cannot place or receive calls through the host PBX.
The display on all digital telephone sets show Offline Mode.
118 Digital Telephone IP Adapter Installation and Administration Guide
Standard 3.0