The problem you have is your chosen panel (Napco) has extremely limited CID and SIA support, hell "I" would be sending 4/2 as well if I were working with those panels but Its not a question of setting up the format, its an issue that yes 4/2 may work now but it might not in the future when the providers decide to make some goofy change in the protocol. I've already seen that scenario happen which is why I don't trust VoIP
A tech who doesn't send every signal with CID isn't going to with 4/2 either, all I can tell you is when I look at the daily list of undefined signals they are all 4/2, I look at 4/2 the same way I look at crank starts on old Ford Model T's, they had a purpose at one time but not anymore
Well when you factor in restorals, cancels and multiple burg signals it can add up quickly, all it takes is one additional signal and you've automatically doubled the onhook time, I could send a dozen SIA signals in the time it takes to send one standard 4/2. Many signals such as exit alarms and recent closings are gaining importance (since they now are SIA standards) and in my opinion should be sent. When you start having to prune signals because they may take too long to send in 4/2 then you have a problem
Trust me on this but the amount of calls is not a factor at all unless the central station is somehow grossly lacking in receivers, it all has to do with preventing undefined signals.
to use CID is now
That is a non-issue, a restoral signal in CID takes maybe 2 seconds, insignificant compared to an additional 4/2 signal. I have yet to hear someone at a central station bitch about restorals although I personally think they are worthless unless they are trouble restorals. I see open/close signals as more of a problem than restorals due to techs forgetting to turn them off
And I don't know why this message didn't quote properly