Have a shared line setup....6 phones, 3 shared lines. If a user answers a call and puts in on hold, the only way another phone can pickup that shared call is to select the button for the shared line on hold FIRST before picking up the handset. If they pickup the handset first and attempt to select the line on hold after that, then all the phones will ring and the call on hold will be lost. Please adjust the functionality so that users and switch between lines without having to hangup the handset each time first.