One or more computing devices, systems, and/or methods for ringless voicemail detection are provided. In an example, a first call attempt to a phone number may be detected. In response to detecting a second call attempt to the phone number occurring within a first threshold timespan of the first call attempt being detected, first processing of the second call attempt is withheld. In response to the first call attempt being cancelled within a second threshold timespan of the first call attempt being detected, second processing of the second call attempt is performed based upon a policy.