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Area Code Rules problem in Windows XP

Posted on 2009-04-07
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Last Modified: 2012-05-06
Can anyone confirm if there is a limit of 250 prefixes/exchanges in Windows XP Area Code Rules?  (CONTROL PANEL, PHONE AND MODEM OPTIONS, DIALING RULES)

I've added a location, then manually added 250 different prefixes/exchanges in the list.  The list allows you to enter as many as you want, but once you click OK and go back, it only lists the first 250 of them.

I believe this is a bug in Windows XP but I cannot find any confirmation from Microsoft regarding this.

Some area codes have over 300 different exchanges/prefixes, so this is a problem.
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Question by:GetFaxingdotcom
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spamster earned 200 total points
ID: 24092024
I couldn't find any applicable articles on MS KB, but I did a little experiment on my own box (which has been updated with latest patches and service packs) and was able to add 308 before my fingers tired out and needed a rest :-D I clicked OK, and exited out of the control panel, went back in and they're still there.
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by:GetFaxingdotcom
ID: 24092273
Thanks for trying this out !  I didn't expect anyone to actually type in 300+ prefixes :-)
Can I ask you how you were entering them?  one at a time, or typing a string of numbers 123 456 666 444 333 222 in the dialog box?  (I think you can do about 20 max at a time)
Now, I'm begining to suspect it may be a bad control character in the cut & paste process.

I've tracked the entries being stored in the registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Telephony\Locations\Location4\AreaCodeRules\Rule0\   stored in a REG_MULTI_SZ Prefixes key.

(action Location and Rule key will defer per machine)
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by:spamster
ID: 24092498
I entered them one at a time, if I would've been more creative i might've figured out I could enter multiple at one time! :)
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