Direct Inward Dialing
The simplest dial plan possible within Lync Server 2010 is when each user in the organization has a direct DID number. DIDs are unique across the PSTN, and therefore, unique with the Lync Server deployment. A PSTN caller or an internal user can use the same dial string to reach another user when DIDs are assigned to each user in the organization.
Caution
The downside of DIDs is that they are longer dial strings than an extension, which means that they require a user to enter more digits to reach a user. The Lync client is primarily based on click-to-dial functionality, so a dial string becomes less of an issue. However, for users manually dialing using keypads, this can be frustrating.
DIDs also typically map to a user’s ...
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