I have a site which has BRI ISDN. calls to 500 ring at reception(501) then 5-6sec later they ring at 509 and 501. How else can an extn ring with delayed ring. I have check the programming "extn and delayed ringing" 501 is set to immediate 509 no ring.
There is no Hunt group programming. the call is not call fwd because if you ring 501 directly it goes to voicemail.
Any help appreciated