NEC 5140 - Manual (Page 15)

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Add Held
To move a call on Hold to another line appearance:
1. Press the available line key.
2. Press the Add Held command key.
3. Press the line key with the flashing icon.
To add a call on Hold to an existing conversation or conference:
1. Press the Add Held command key.
2. Press the line key with the flashing icon.
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 Trade Calls command key.