Move Ahead With VoIP Carriers
Investing in the VoIP carrier service is a profitable business, as no large infrastructural investments are required. To venture in a carrier service, provider requires his own network of VoIP gateway switches to connect PSTN users.
Source: ezinearticles.com

VoIP Termination - Equalises the Cost of Calling
The primary reason for shifting to VoIP termination service is cost, as it equalises the cost of long distance and international call to a minimum. For generating a call via VoIP termination service requires a computer with an Internet connection, ATA for converting analog voice into digital signals, IP phone and headset.
Source: ezinearticles.com

Research and Markets: VoIP is Now Accepted by Businesses as the Way Forward for Voice Infrastructure (Business Wire via Yahoo! Finance)
DUBLIN, Ireland—-Research and Markets has announced the addition of "Success Factors for Hosted and Managed VoIP in Europe" to their offering.
Source: biz.yahoo.com