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Inconsistent format and duplicate telephone numbers are displayed in a contact card in Lync 2013

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Symptoms

Assume that you have contacts in Lync 2013 who have at least one telephone number in their contact card. You sign in to Lync 2013, and then you open a contact card of one of the contacts. In this situation, a telephone number is displayed two times in the contact card.

Note The telephone number that is displayed in the contact card may be an E164 number or an extension.

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Cause

This issue occurs because Lync 2013 aggregates the contact card data from multiple sources, and sometimes different formats of the same telephone number are interpreted as separate entities.

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