What is virtual FSP?
A3. A virtual FSP, opposite to ordinary FSP, is not integrated with Telephony Service Provider (TSP), that interfaces telephony hardware. Some FSPs do not correspond to any telephony hardware at all, for example FSP that facilitates a connection to the Internet Fax Service. The FSP and TSP integration allows software developers to program complex fax / voice call scenarios, where the media state of the same call changes between voice and fax (for example, fax on demand applications).
