This has rarely been an issue, however the fix for this would be to allow time spacing between dialing digits (123xxxxx......) which means say we set it at 2 second gap before sending out, you would need to wait an aditional 2 seconds before the call was legitimately sent to voicemail. We can make this correction for you by simply putting in a ticket in regards to your dial plan.
I will be looking into this, I know we've had a quite long thread on custom call routes and the various scenarios quite a bit back in this forum.
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