NEC UX5000 Feature Handbook page 148

Tandem Trunking
Method B (Requires a
To make a line-to-line Conference:
1. Set up first outside call.
This can be a call you placed or answered.
HOLD
2. Press .
3. Set up second outside call.
4. Press FUNCTION (Transfer).
You drop out of the call and leave the outside callers talking to each other.
The line keys light steadily for both outside parties.
To end the line-to-line Conference:
LINE * 3
1. Press + .
This immediately disconnects the Conference.
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[Transfer] key)
FUNCTION