Users 17SIPxNano IP-PBX Getting Started Guide 3 • UsersUser IDsFor each SIPxNano user, you must supply a unique, alphanumeric User ID. This User ID, along with anumeric Personal Identification Number (PIN), is required for end user access to the SIPxNano interface.Note SIPxNano requires a unique User ID for each user. Patton recommends thatyou assign a unique PIN to each user, and also encourage end users tochange their PINs frequently.In addition, you can supply a numeric extension number and one or more aliases for each user. These addi-tional identifiers provide flexibility for both call addressing and user interface access.You assign a numeric-only identifier to your SIPxNano users so that:• Callers can dial numbers, rather than full SIP URLs, to address calls• End users can access SIPxNano features, including voicemail, from the phone topEither a user’s required User ID or the optional extension can be the numeric-only identifier. If you assignnumeric User IDs to your users, an additional extension is not needed.Note If you use extensions, all User IDs and extensions must be unique (the samenumber cannot be used as both a User ID and an extension).You can employ an alphanumeric naming convention for your SIPxNano User IDs. For example, a User IDcan be made up of a first initial and last name (jsmith), or from first and last names (jane_smith); as a result,end users can have the same identifier that they use for email. Alternatively, User IDs can reflect extensionnumbers, Direct Inward Dialing (DID) telephone numbers, or some other numbering scheme that youadminister.When you add a user, SIPxNano automatically sets up a user line with a SIP URL based on the new User ID sothat calls can be directed to that user. This line automatically registers with the Comm Server’s SipRegistrarcomponent for each SIP phone assigned to the user. SIPxNano stores all registered SIP URLs in the Registra-tion database. For more information on Registrations, see the section “Registrations” on page 74 in Chapter 7,“Diagnostics” .