• When one of the main extension or sub extension is busy, the paired extension cannot make a call.
• 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.
• The
message waiting lamp can be controlled by both the main extension and sub extension simultaneously.
• The sub extension of a paired extension can be programmed by using the Wireless XDP feature number.
• 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.
• 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
• For features such as Hold Recall and Timed Reminder 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.
• 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.
PC Programming Manual References
10.6.1 PBX Configuration—[2-6-1] System—Numbering Plan—Main—Features—
Parallel Telephone (Ring)
Mode Set / Cancel
12.1.1 PBX Configuration—[4-1-1] Extension—Wired Extension—Extension Settings
→Option 1— Wireless XDP / Shared Extension
→Option 1— Ring Pattern Table
→Option 5— Automatic Answer for CO Call
→Option 6— Forced Automatic Answer
→Option 7— ISDN Bearer
→Option 8— SLT MW Mode
User Manual References
1.9.13 Using Your phone in Parallel with a Wired Telephone (One-numbered extension)
Feature Guide References
2.9.1 Primary Directory Number (PDN)/Secondary Directory Number (SDN) Extension
3.2.2.19 Live Call Screening
(LCS)
168 Feature Guide
2.11.10 One-numbered Extension
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