Anyone out there using VOIP for business class inbound/outbound services? I've found my VOIP provider to be less than reliable, SIP registrations timeout, calls drop, they claim IAX2 is too buggy (I find that hard to believe), and pretty much blame all problems on other circumstances and don't actually fix their problems. Their auto rollover doesn't even work right, so if my PBX is down, I just miss calls half the time. This isn't my first provider either, I've tried a couple now. Controversy, I've never had problems with my Vonage line, and I've had them for 3 years now (I know, unfair comparison). Anyone out there with better experiences? I'm mainly interested in hearing if people are replacing land lines with VOIP in a business setting and optionally what setups they've implemented to minimize or eliminate downtime (backup system, call routing, multiple SIP providers, etc). I realize this isn't the business list, so if you're going to recommend a provider, email me off list so as not to anger the natives. Thanks! -Kenneth