NEC Electra Elite 48/192 Features And Specifications Manual page 103

Issue 6
A - 82
When this feature is activated, the incoming trunks set for Automatic
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Trunk-to-Trunk Transfer (winking) are available for outgoing use.
The outgoing telephone number cannot exceed 24 digits.
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After the system dials the outgoing number, the incoming call is
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transferred, the trunk LED assigned to Line keys is On steady, and
the call cannot be answered.
Automatic Trunk-to-Trunk Transfer
Electra Elite