1. In the EAC, navigate to Unified Messaging > UM dial plans, and then click Add .
   
   
2. On the UM Dial Plans page, complete the following boxes:
   
   
   • Name   Type the name of the dial plan. A UM dial plan name is required and must be unique. However, it's used only for display in the EAC and the Shell. If you have to change the display name of the dial plan after it's been created, you must first delete the existing UM dial plan and then create another dial plan that has the appropriate name. If your organization uses multiple UM dial plans, we recommend that you use meaningful names for your UM dial plans. The maximum length of a UM dial plan name is 64 characters, and it can include spaces. However, it can't include any of the following characters: " / \ [ ] : ; | = , + * ? < >.
     
     Although you can name a new UM dial plan to include spaces, if you integrate Unified Messaging with Office Communications Server 2007 R2 or Microsoft Lync Server, the name of the dial plan can’t include spaces. Therefore, if you created a dial plan with spaces in the display name, and you’re integrating with Office Communications Server 2007 R2 or Microsoft Lync Server, you must first delete that dial plan and then create another dial plan that doesn't include spaces in the display name.
     
     

     Important:

     Although the box for the name of the dial plan can accept 64 characters, the name of the dial plan can't be longer than 49 characters. If you try to create a dial plan name that contains more than 49 characters, you’ll receive an error message. The message will say that the dial plan name couldn't be created because a default UM mailbox policy name couldn't be generated because the UM dial plan name is too long. This happens because when you create a dial plan, a default UM mailbox policy is also created that has the name <DialPlanName> Default Policy. Therefore, the name of the UM mailbox policy is 15 characters longer than the name of the dial plan. The name parameter for both the UM dial plan and UM mailbox policy can be 64 characters. However, if the name of the dial plan is longer than 49 characters, the name of the default UM mailbox policy will be longer than 64 characters, and this isn't allowed by the system.

   • Extension length (digits)   Enter the number of digits for the dial plan. The number of digits for extension numbers is based on the telephony dial plan created on a Private Branch eXchange (PBX) or IP PBX. For example, if a user associated with a telephony dial plan dials a four-digit extension to call another user in the same telephony dial plan, you select 4 as the number of digits in the extension.
     
     This is a required box that has a value range from 1 through 20. The typical extension length is from 3 through 7. If your existing telephony environment includes extension numbers, you must specify a number of digits that matches the number of digits in those extensions.
     
     When you create a Session Initiation Protocol (SIP) or an E.164 dial plan and associate a UM-enabled user with the dial plan, you must still input an extension number to be used by the user. This number is used by Outlook Voice Access users when they access their Exchange 2013 mailbox.
     
     
   • Country/Region code   Use this box to type the country/region code number used for outgoing calls. This number will precede the telephone number dialed. This box accepts from 1 through 4 digits. For example, in the United States, the country/region code is 1. In the United Kingdom, it's 44.
     
     

This example creates a new UM dial plan named MyUMDialPlan that uses four-digit extension numbers.

	Copy Code
New-UMDialplan -Name MyUMDialPlan -NumberofDigits 4

This example creates a new UM dial plan named MyUMDialPlan that uses five-digit extension numbers and supports SIP URIs.

	Copy Code
New-UMDialplan -Name MyUMDialPlan -UriType SIPName -NumberofDigits 5