TalkinIP enables you to make calls to locations worldwide at the absolute lowest rates.
TalkinIP provides you outbound calling to US from 1.5 cents per minute and service to over 227 countries at very competitive international rates.
Get started for as little as $15 prepaid credit. Your credit will never expire, so you can make calls next week or next year.
They even have howto setup documents for PBXs and softphones