Third-party verification refers to a service outsourced by outbound telemarketing companies to validate customer sales completed over the phone. In the U.S., telemarketing companies are required by law to use TPV services when selling products and services over the phone.

Last year, Pilipinas Teleserv bagged a TPV outsourcing deal with a U.S.-based telemarketing firm, which also counts as the company's first-ever client based outside the Philippines.

David said the demand for outsourced TPV services in the U.S. is huge. 'I haven't come across Indian companies that are into TPV,' he added, noting that TPV as a service is also relatively new for Philippine-based call center operators.

Bringing in results

In doing TPV, agents from a service provider like Pilipinas Teleserv simply listen to recorded telephone conversations and check whether the sale is valid or not, and make sure that all the required information was provided by the customer.