I have noticed that since the version of PBX Manager 6.0.1.66 that SOMETIMES my inbound calls that go through IVR / Voice Menus and/or Hunt List just ring to the caller but don't ring on the phones and then the call never goes to voicemail. I know the system is getting the call as it will be answered by the IVR first.
We never had this problem before the last three version upgrades. I just put in #69 and will check its functionality although the Change Log doesn't list this problem as one of its fixes.
Greg