For one time advertising promotions or typical requests it is easier to use services of the outsourced call center. Main advantage of such a service is that the company who rents it is free from the necessity of keeping the operators and organizing their work flow.
Abbeynet is a leading European company focused on state-of-the-art VoIP technologies based on the SIP standard, including integration between fixed and mobile networks in an all-IP context and web-based VoIP service architectures.