If a digital station attempts to transfer the two parties together, the call-appearance lamp flutters, indicating a denial. If transferring over a DCS trunk, the denial may drop the call, since the call can be transferred, and the other system is queried for disconnect supervision.

If an analog station attempts to transfer two parties together by going on-hook, the analog station is no longer on the call and the transfer cannot be denied.

If a CAS attempts to transfer two parties together by pressing the release key, the release link trunk is released and the branch attempts a transfer by hanging up.

If a station conferences every party, the conference can occur since the station has disconnect supervision. When the station is dropped from the call, the call is dropped since the other parties do not have disconnect supervision.

If a station is call forwarded off-premise to a trunk without disconnect supervision, the calling party without disconnect supervision is routed to the attendant.