When some calls in to a DID that isn't assigned, it goes to the IVR and as soon as the caller makes a choice that rings an extension, it hangs up. The dialed extension may chirp or just turn on the backlight. I have the IVR key press events of: 0 -> Extension 100 (Operator), 1 -> Dial by Name, 2 -> a ring group, 3 -> a queue. I allow caller to dial extension directly. My extensions are all 3 digit extensions starting with 200. When I dial into the IVR from an extension by dialing 6500, everything seems to work fine. This only seems to happen with an inbound call, which is coming in via a SIP trunk.
S20 IVR hangs up, extension may take notice