During a power failure, specific extension telephones are automatically connected to specific
exchange lines. This provides exchange line conversations between the following extensions
and exchange lines.
Exchange line 1 : extension port 01
Exchange line 4 : extension port 09
A single line telephone (SLT) can work in case of a power failure. Connect an SLT to the
above extension port. For more information,refer to the Operating Instructions.
• All other conversations, except the above combinations, are disconnected during a power
failure.
• Only an exchange line can have a conversation. All other features do not work.
• We recommend connecting a single line telephone (SLT) in parallel at extension ports 01
and 09, so that an SLT can be used during a power failure.
• Connection Reference
2.18 Auxiliary Connection for Power Failure Transfer
• Related Feature Reference
Parallelled Telephone Connection
• Operating Instructions Reference
1.7 Useful Features, “Power Failure Transfer”
3-56 Features
P3 Features
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Preferred Line Assignment — Incoming

A proprietary telephone user can select the method to answer incoming outside calls from
the following 3 line preferences. System Programming and Proprietary Telephone Settings
are required.
No Line Preference: When an incoming call is received, the extension user must go
off-hook and then press the flashing line key.
Prime Line Preference: When incoming calls are received at the same time, the user
can receive the call on the preferred exchange line by only
going off-hook.
Ringing Line Preference:When an incoming call is received, the user can receive the
call ringing at their telephone by going off-hook.
• A single line telephone can only set “Ringing Line Preference”.
• Line access key(s) (Single Exchange Line, Other Exchange Line or Trunk Group) should
be assigned to line key(s) beforehand.
• Required System Programming
[408]–[410] Flexible Ringing Assignment — Day/Night/Lunch
[411]–[413] Delayed Ringing Assignment — Day/Night/Lunch
• Related Feature Reference
Line Access Keys
• Operating Instructions References
1.2 Proprietary Telephone Settings,“Customising Your Telephone Functions”,
Preferred Line Assignment — Incoming
1.2 Proprietary Telephone Settings,“Customising the Buttons on Your Telephone”,
Line Access Keys
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Power Failure Transfer

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