Mitel 4015 - Manual (Page 14)

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Conference
To form a Conference when a two-party call is already in place, or to
add another party to an existing Conference:
1. Press TRANS/CONF.
2. Dial the number of the next party.
3. Wait for an answer.
4. Press TRANS/CONF.
To leave a Conference:
z
Hang up.
Conference Split
To Split a Conference and speak privately with the original party:
1. Press TRANS/CONF.
2. Dial *41.
Swap
To call another party when you are in an established two-party call:
1. Press TRANS/CONF.
2. Dial the number.
To alternate between the two parties:
z
Press the Swap/Trade feature key.