Need your help - Trunking Services

Hi Guys,

I need your help with some information…

I have a small office, in the past I have used asterisk for my home setup and also in other locations. I have never had a requirement todo more than 5 phones on asterisk.

I need to find a company that I use for my incoming and outgoing trunking services. I have a requirement for 25-50 users. Anyone know of a good one to use? Any possiblity that I could find a service on this scale for a flat per month price?