Panasonic KX-NS700 Feature Manual page 239

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If the main extension is a KX-UT series SIP phone, neither the main extension nor the sub extension
can receive calls. This condition applies regardless of the type of telephone used for the sub extension.
[KX-UT series SIP phone and general SIP phones]
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The no-ring or delayed ringing features are not activated when a new call is received at a paired
extension during a call. In this case, the telephone will ring normally.
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When making an extension call to a paired main extension number using voice-calling, a ring tone is
heard at the sub extension.
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When a call is received to a paired main extension number in LCS with Hands-free mode, the call will not
be received at a sub extension.
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The following features are available only at the main extension.
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OHCA (→ 14.1.3 OHCA (Off-hook Call Announcement))
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Whisper OHCA (→ 22.1.5 Whisper OHCA)
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When a paired main extension number is paged, the sub extension will not be paged. (→ 15.1.1 Paging)
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When a paired main extension number is called for a conference, the call will also arrive at the sub
extension.
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The following features are not available both at the main/sub extension.
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Walking Extension (→ 22.1.2 Walking Extension)
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Enhanced Walking Extension (→ 22.1.3 Walking Extension, Enhanced)
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When one of the main extension or sub extension is busy, the paired extension cannot make a call.
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While a sub extension is activated as a One-numbered extension, calls for the original extension number
of the sub extension will not be received.
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The message waiting lamp can be controlled by both the main extension and sub extension
simultaneously.
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The sub extension of a paired extension can be programmed by using the Wireless XDP feature number.
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When an extension that is registered as a member of an ICD group is paired as a sub extension,
incoming calls to the sub extension (via the ICD group) will not ring. At the same time, the sub extension
is forced to log out from the ICD group.
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The following settings for each telephone type are activated individually depending on the settings of the
main/sub extension.
SLT MW Mode
Automatic Answer
ICM Tone
Ring Pattern Table
ISDN Bearer
BGM On/Off
LCS On/Off
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For features such as Hold Recall that call the extension back and are set at the extension, the callback is
received only at the main or sub extension that set the feature.
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When features such as Transfer Recall redirect a call back to the originating extension, the call is
received at the extension number of the main extension (paired main extension number), and both the
main and sub extensions will ring.
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For the Timed Reminder feature both the main and sub extensions will ring.
Document Version 2017-06
14.1.5 One-numbered Extension
Feature Manual 239