With the parameter ONHKTRNS in AMO FEASU it is possible to activate the function that a call transfer is allowed before the consulted party has answered the call in the whole system. This systemwide parameter is valid for every consulting party.

The parameter NOONHKTR (no on hook transfer) in AMO SDAT deactivates the on hook on transfer function per user or a group of users. This disables or enables for this station a call transfer to a ringing or busy destination.

When a call transfer to a ringing or busy destination is done it is determined if this call transfer is allowed considering the AMO FEASU and AMO SDAT parameters. If this is allowed the call is transferred. Otherwise the consulting party gets an immediate recall from the held party.