Unwanted calls are detected by determining all calls which are unverified by prior prompting the caller to provide data, such as “press 5 to be connected” or “say ‘proceed’” before being allowed to connect. Once connected, the called party may indicate that the call was/is unwanted and should be disconnected. Then, the call is disconnected from the called party while being maintained with the switch. The call is also recorded in embodiments of the disclosed technology, with the audio therefrom, or audio signature, being used to detect future unwanted calls. The detection of future unwanted calls may further be modified or determined based on association of called parties to each other, which, additionally, may be used to change the threshold of closeness of audio signatures between calls.