[maarek]

We use OnSIP, http://www.onsip.com/ I HIGHLY recommend them. Call quality is great, support is competent, and the pricing structure is usage based, not a flat rate. I don't work for them, and I am not an affiliate, but I have been a customer for 3-4 years.

[takrupp]

This looks interesting. Do you need any pbx or if i got 5 IP phones, set them up, they would just work?

Need to crunch some numbers on per minute vs flat rate. One of the businesses is phone intensive, probably use 120-240 minutes per day.