Burglary hotspots are normally served by Yale or the local "value" alarm co.
I been knocked back on a few areas where I can't afford to live, one with keys for ragtop A5 left in the garden as they could get it started
I try to avoid speech diallers,
IIRC the last time I had the misfortune of touching a Texecom speech dailer it had all the menu's for texting but was the speech only product.
whoops...
1st I'd link loop at the pcb & check the new controls,
if the fault reappears when the loop is put back on the panel, I'd look 1st at the devices which contain isolators,
good luck
being northern & poor... a £400 intercom for people to wear out or vandalise ?
I'd use a normal intercom with a PSTN interface,
However I'd not expect a dental surgery to operate without a reception ?
consumer products - eg an IP Phone are consumer electronics..... cheap & freely available
a 0.5mm drill from screwfix is quite cheap, a medical 0.5mm drill is quite pricey...
There's different versions of same products....
If you have a picture of the PCB a popular alarm forum or whoever rebranded or manufacturered it might have be able to help
IIRC xr1 is panel with on board keys x2 is panel & keypad
when the ADE product changed models Senate still called there's XR
You need product knowledge of ADE pcbs to you guess what your "xr"is really is
There not graded & the programming makes little sense to me, I take the view that paying me an hr to program it is better spent fitting better controls