The services provided by professionals in particular field. For example, a company may charge a certain sum of money for the certain tasks their consultant accomplished for the company who ordered the service.
VoIP Terminations and Hosted VoIP Switch Partition : VoIP Reselller, VoIP Callshop, VoIP Calling Cards, VoIP Callback, VoIP PC-To-Phone, VoIP Device-To-Phone, DID, E-Commerce, etc.
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