NEC Electra Elite 48/192 Features And Specifications Manual page 597

Issue 6
T - 16
Use Memory Block 3-04 (Trunk-to-Trunk Transfer Yes/No Selection)
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to specify per trunk whether (YES) or not (default: NO) to allow this
feature.
Restrictions:
A Single Line Telephone cannot be used for Trunk-to-Trunk Transfer.
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General:
All lines used for Trunk-to-Trunk Transfers must provide remote
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disconnect supervision.
A conference circuit is not required for a Trunk-to-Trunk Transfer.
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A Station user cannot reenter a Trunk-to-Trunk Transfer after the
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connection is established.
After a Trunk-to-Trunk Transfer is established, both trunks are
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released when a disconnect signal is received by either trunk or
when the Automatic Disconnect Time runs out.
When a Trunk-to-Trunk
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Appearance keys, the LED stays on until the trunks are released.
Transfer is established using
Trunk-to-Trunk Transfer
Electra Elite
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