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Microsoft® Lync® Server 2013 Unleashed Second Edition by Randy Wintle, Alex Lewis, David Ross, Tom Pacyk

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Ordering Normalization Rules

Site prefix scenarios directly affect Lync Server telephone URIs and dial-plan normalization rules. In Lync Server 2013, a telephone URI must be unique across the organization for it to be routed correctly. This means that even if Alice and Joe have the same extension within their own offices, their Line URIs must still be unique.

For example, assume that San Francisco users have DID numbers all using the +1 (415) 777-3xxx format. Alice’s telephone URI should be assigned as tel:+14157773234. Joe’s office has DIDs as well with a +1 (312) 444-5xxx format, and his telephone URI can be assigned as tel:+13124445234.

Now the URIs are unique, but this does not account for the expected user behavior of how to dial three digits ...

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