Another question if I may, Rambo & if you're still there?
I have configured a SPA3000 as a 'hotline' - when it goes off hook it rings '60' on my PBX - all of this works - calls can be answered and it's 90% working satisfactorily.
The only slightly disconcerting thing is that callers on the hotline (i.e. outside the building won't know the call is progressing because they're not fed a calling tone (what IS the correct work for that tone?!) - they just get nothing until the call is answered.
Anyone know how I would configure the Spa3K to dish out a 'calling tone' too?
This was all I changed to enable hotline functionality: