iMac randomly making ringing noise


hello, upgraded el cap im sure of have. imac keeps making strange ringing sound ringtone. i'm not receiving call iphone or facetime request. there no notification on screen , quoting programs doesn't seem although cannot verify happens closed , os running. swear im not crazy might if can't me figure 1 out! don't know if can upload audio files ill record next time if can. i'd happened around same time in , no don't have alarm app. thx looking
 



Forums Macs macOS OS X El Capitan (10.11)


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