chipk77

I had some experience with Asterisk at a previous job as well as Avaya. When it came time for our legacy digital phone system to be replaced, we looked at several, including big names like Cisco, Avaya, and others not quite as large, like Mitel. Price point for Fonality was ridiculously low compared to others, even with redundant hardware. Installation team was great (Ricoh USA, who is their primary reseller now). One of the only major problems I can report is with occasional dropped calls.
Others who have complained about reliability and service probably brought many of their problems on themselves by trying to save a buck with SIP trunking or a cut rate telco provider. Do you really want your phones going over your Internet? Unless you live in a big metro area and have rock-solid Internet that never goes down, never has any speed issues, and you have a strong networking team able to implement QoS, etc., do not use SIP. These people who use SIP and blame Fonality are barking up the wrong tree.
Finally, the only reason I gave "Reliability" a 4 instead of a 5 is that we had occasionally memory leak issues. You can't expect much less from something that relies heavily on Java. We upped the memory and would reboot about once a month off-hours, but the problem was fixed with an update eventually (updates / upgrades included with maintenance).