HIK intercom should be able to do this having a play with one tomorrow
Comelt will work with ease but will require dongle for each PC it is running so cost may be a problem
We don't have part P over here. Any domestic install I have ever done we have installed own fused spur. Don't do much domestic now and most jobs are new were spurs are in place.
Just back from a meeting this afternoon were this was brought up. Basically site has an intruder alarm installed by national company we have won tender to install a smoke cloak in all sites it was suggested we add spur unit beside each IAP panel spur and spur off into existing can my guys do this without issuing a cert for adding to circuit?