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.
The VMX is an IP PBX that supports up to 128 phone extensions and provides integrated features including secure call recording, call centre call queuing, automated attendants, automatic call distribution and remote/home worker connectivity.