Hello Arvin,
Quote: ” before “error in connection” displayed on the cellphone of a calling party after the said party initiates a call to the called party.”
Quote: “when the called subscriber’s cellphone received a loss of signal from the cellsite at the time when the calling subscriber calls the said subscriber”
Regarding your comments, I am not sure whether or not RF Signal Problems register as “No Answer” in the serving switches. And I never thought about it. Acutually I have experience for CDMA system only. However I think that if no channel were seized between Subscriber and BTS then it shouldn’t be a CNA.