How to enter a phone number with an extension?

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Posted on by Jonathon Minard

On the Customer Card, I'd like to enter a phone number which has an extension. Typically this would be written like "555-5555 ext. 5.", but Business Central disallows the "ext" portion of that. Is there an alternate standard way to denote an extension number?

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Dynamics 365 Business Central

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Valentin Castravet 31,852 Super User 2026 Season 1 on at

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I use brackets as text is not allowed i.e. 555-5555 (5)

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Inge M. Bruvik 1,153 Moderator on at

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You can use any other character than a letter to separate them f.ex #.

Letters are not allowed in the phone numbers in Business Central.

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YUN ZHU 97,421 Super User 2026 Season 1 on at

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Hi, This is standard processing. Although this field is Text type, but the system has an additional judgment.

Hope this helps as well.

Thanks.

ZHU

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