Direct Inward Dialing

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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 internal extension. For example, at Company ABC’s San Francisco office, Alice has a DID of +1 (415) 333-3234, but internal users can simply dial a four-digit extension, 3234, to reach Alice. This gives the flexibility of numbers being unique across the site, but with the capability for PSTN callers to reach users directly. Internal users also have a short dial string to remember in order to reach Alice.

On the Lync Server 2010 configuration side, Alice’s telephone URI field should be entered as tel:+14153333234 in order to uniquely identify her in the organization. A normalization rule within the San Francisco dial plan converts a four-digit extension starting with 3 into the full E.164 URI for users. That rule resembles the following:

Dial Plan: San Francisco

Name: Four digits beginning with 3 to San Francisco

Starting Digits: 3

Length: Exactly four digits

Digits to Remove: None

Digits to Add: +1415333

This rule accommodates the dialing habits of San Francisco users, but consider a scenario where Company ABC also has a San Jose office where users have DIDs starting with +1 (408) 444-4xxx. Because all the San Jose extensions start with a 4, any four-digit extension beginning with a 4 can be translated to include the San Jose DID prefix. San Jose users should have a telephone URI assigned resembling tel:+14084444xxx.

Dial Plan: San Francisco

Name: 4 digits beginning with 4 to San Jose

Starting Digits: 4

Length: Exactly four digits

Digits to Remove: None

Digits to Add: +1408444

After this rule is added to the dial plan, San Francisco users can dial by entering just four digits on a keypad or within the Lync client and correctly route to a user in either San Francisco or San Jose.

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