Alcatel Carrier Internetworking Solutions OmniPCX 3AK 19522 - Manual (Page 46)

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TTw wiinn--sseett ccoonnffiigguurraattiioonn
This configuration allows two terminals to be grouped under a single number.
Your terminal is the main terminal, while the other one, usually a DECT terminal, is
the secondary one. Each telephone has its own directory number, but the twin set
number is that of the main terminal.
When you receive a call, the two terminals ring simultaneously. When one terminal
takes the call, the other stops ringing.
When all the lines of the main terminal are busy, the secondary terminal (DECT)
does not ring.
The secondary terminal can always be called by its own number, but in this case
the twin-set function is no longer taken into account.
Most functions are common to the two terminals, e.g. call forwarding, appointment
reminder, the various messages, etc., but the others remain specific to each
terminal, e.g. personal directory, automatic callback, out of service, padlocking the
terminal, etc.
Note: when creating the twin set, all the programmed functions (call forwarding, call-backs,
messages, etc.) are cancelled on both terminals.
For further information on this configuration, contact your system supervisor.