The present disclosure is directed to a system and method of providing call source information. In a particular embodiment, the method includes receiving call source information and call destination information at a mediation messaging server of an Internet Protocol Television (IPTV) system, where the call source information and the call destination information are related to a call received via at least one of a switch of a Public Switched Telephone Network (PSTN) and a wireless telephone network. The method also includes determining account information based on the call destination information and sending the account information and the call source information to a notification server of the IPTV system, where the notification server sends the call source information to a set-top box device of an IPTV user via an access network of the IPTV system.