I would guess you have a CTX of some type since you said you used Winadmin. Not sure about voicemail. You can make voicemails any extension numbers you want. I wouldn't make then the next consecutive numbers.

They would be in a Hunt group. Since you changed the numbers, the probably are not anymore. The hunt group may still exists, with the pilot, if any. I'm just guessing, but it looks like 45654 is the pilot extension for the voicemail. Look for the hunt group with that as pilot.

Since you already changed things once, why don't you make the VM extensions a higher extension numbers like 4501-4504. Then you willl be fine up to ext 44 (can't use 45).