It's the same if they bought your preferred panel and said fit it? They still won't pay your labour charge
Customers don't always understand were not paid to be labourers, your paying for the technical skill (from some) just like other sectors get paid £500 a day
Once word gets you d your doing £199 labour for alarms you will have to move to the coast (geezer)
Am i correct in saying sdi has essentially been killed off like ahd , so won't be available much in the future ?
Market leaders tvi and cvi
But straight ip onvif still have advantage of compatibility
Get a digital volt meter unless you intend to guess , because you have allot info above , have you tried any yet?
There's no garuntee there's no faults present on the existing wiring unless you know how to test the cables
Although I think you will get stuck programming it , as above you can read it manual , mean time run a cable to every sensor point to get started and bellbox location
Com2400 leave it for now will just give you more headache I believe