Asterisk Configuration

>>>> I need to find a find a VOIP service and configure an Asterisk server to
>> make out going calls only.
>>>>> This server will be in a Co Location with no access to an analog phone
> line.
>>> What is the best VOIP service to use with Asterisk?
> Do I need any additional hardware or software besides the Asterisk server?
> I want the connection to be as simple as possible.
>
I use arrivaltel.com for outbound calls from my asterisk server. My call
volume is very low, but they've been perfect for me.
Barry Roberts