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

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Site Prefixes

A common scenario with an organization spread across multiple sites is that extensions are not unique within the organization. Typically, a PBX exists in each site and the same extensions are used across sites. When this occurs, either users can use a full DID to reach users in another site, or a site prefix or steering code might be assigned.

For example, consider a scenario in which Company ABC has offices in San Francisco and Chicago. Alice and Bob both work in the San Francisco office, where Alice has extension 234 and Bob has extension 456. When Bob wants to dial Alice, he can simply dial 234 and be connected immediately. Now assume that Joe works in the Chicago office where a different PBX exists, and also with extension 234. ...

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