A method and system provides for notification of a called party of an incoming voice phone call intended for the called party even while the called party is engaged in data communications via a dial-up modem. In response to a calling party placing a call, a telecommunications network determining whether the called number is busy. If the called number is busy, the telecommunications network determines whether the called number is engaged in data communications. If the called number is engaged in data communications, the telecommunications network further: determines a data communication protocol being used by the called party to access the data network via a modem device, retrieves from a user profile of the called party one or more user notification addresses associated with the data communication protocol, and transmits an incoming call notification message to the one or more user notification addresses of the called party. A reporting notification message is further transmitted by the telecommunications network to the calling party to let the calling party know that the called party has been notified of the incoming call.