Okay, now I understand why you had the problem.
This sort of technique -- using "placeholder" extensions -- is an extremely poor practice because it requires the system to use "conflict dialing." The call can't complete until the inter-digit timer waits to see if you're going to dial another digit.
It is better to leave the unused PLIDs unprogrammed. This also tells you, later, that the PLID is available, whereas a "placeholder" makes it look like the PLID is in use. I recommend that you delete all of the "placeholders."
