An aspect provides a method, including: detecting an incoming voice call at an information handling device; detecting one or more external notification extension conditions at the information handling device, tracking user-device interactions to build a pattern of user behavior with respect to external conditions; updating the one or more external notification extension conditions based on the pattern of user behavior; and in response to detecting one or more updated external notification extension conditions at the information handling device, extending a notification of the incoming voice call at the information handling device. Other aspects are described and claimed.