Allow 7-digit phone numbers

Outlook adds my area code in parentheses before each 7-digit local phone
number I type. My new cordless phone system allows me to transfer numbers
from Outlook to my phones; cool idea. Unfortunately, my local phone
company's switcher will not accept a ten digit number without an initial "1"
making it a toll call.
Is there a way I may record 7-digit numbers in Outlook?

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