Average retires alarm panels make to contact central station

Hi, sorry if these forums are not the place for this kind of question. Anyway, I am using Asterisk (software PBX) and I am noticing Asterisk does not receive the event codes 100% of the time. Asterisk is not perfect, and it has taken a lot of configuration to increase consistency. Now, I am wondering how often an alarm panel’s DTMF signals are noisy/not perfect to the point the alarm panel has to retry sending the event code to central station. So far my highest failure rate is about 5 retries, and avg. is 1.5 retries. But those 5 retries are like a minute’s worth of retries. Is there some sort of Industry Average that exists?
Thanks!