We have had a Panasonic TEA308 phone system installed in our workplace a few years ago with 3 Pansonic KX-T7730 handset phones connected.
Our BT lines coming in are
one BT telephone number on a multiline ( lines 1 & lines 2 )
And 1 Single line BT telephone number on line 3
At the time we asked for the multiline ( line 1 and line 2 ) to ring on the handset with all incoming calls and line 3 not to ring on the handsets
Can you please help with the programming so that line 3 now rings on the handset for all incoming calls.