[chimes]
exten => s,1,Wait(1)
exten => s,n,Playback(custom/my-chime-file)
; exten => s,n,SayUnixTime(STRFTIME(),,IMp)
; exten => s,n,Playback(digits/12)
; exten => s,n,Playback(digits/oclock)
; exten => s,n,Playback(digits/p-m)
exten => s,n,Hangup()