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1.10 Conversation Features
86 Feature Guide
1.10.9 Parallelled Telephone
Description
Any proprietary telephone (PT) can be connected in parallel with a single line device, such as a single line
telephone (SLT), fax machine, or modem.
When parallel mode is used, the 2 telephones function as follows:
• Both share one extension number.
• Either telephone or device can make or answer calls.
Conditions
• System programming determines the SLTs that can be connected in parallel with a PT ( Parallelled
Telephone [610]).
• When the SLT is in operation, the display and LED (Light Emitting Diode) indicator on the paired PT will
function in the same way as when the PT is in operation.
• The following features cannot be used with an SLT connected in parallel with a PT:
– Call Splitting
– Conference
– Door Open while connected to the doorphone
– External Feature Access (EFA)
– Hot Line
• An SLT connected in parallel with a PT will not ring if the PT is:
– In Hands-free Answerback mode ( 1.4.1.4 Hands-free Answerback).
– In Voice-calling mode (Alternate Receiving—Ring/Voice) ( 1.5.1.1 Intercom Call).
• An extension user cannot make a call from the SLT if the PT is:
– Playing background music (BGM)
– Receiving a paging announcement over the built-in speaker
– In programming mode
• Both the PT and the SLT will ring for incoming calls (if the ringer is turned on).
• If one telephone goes off-hook while the other telephone is having a call, a 3-party conference call will
be established. If one telephone goes on-hook, the other telephone will continue with the call.
Installation Manual References
2.5.2 Connecting Extensions in Parallel