# RDN Synchronization

## Description

Remote Directory Number (RDN) Synchronization uses SDS to distribute the telephone directory entries to all the element databases in a network or cluster. In a network or cluster, any telephone directory entries that you add, modify, or delete at an element (MiVoice Business system) through the System Administration Tool are automatically distributed to the other elements. The updates are distributed to the other elements in the network or cluster via System Data Synchronization (SDS). In this mode, you can also configure device resiliency from the System Administration Tool (see Embedded Resilient Device Support for details).

NOTE: All elements within the same network or cluster that use SDS must be configured with the same telephone directory method.

The following graphic illustrates how the telephone directories are synchronized across a cluster using RDN Synchronization.

The following table identifies the forms that are updated with a new telephone directory entry. Both Element A and Element B are sharing data, and the Telephone Directory form is being shared at the "All 3000 ICP" scope. If you add a new entry through the User and Services Configuration form on Element A, the entry is written into the databases of both Element A and Element B and recorded in the following forms:

Forms on Element A | DN listed in form | Forms on Element B | DN listed in form
User and Services Configuration | Yes (local number) | User and Services Configuration | No (remote number)
Telephone Directory (shared at "All 3300 ICP" scope) | Yes | Telephone Directory (shared at "All 3300 ICP" scope) | Yes
Remote Directory Numbers | No (local number) | Remote Directory Numbers | Yes (remote number)

## Requirements

RDN Synchronization is subject to the following requirement:

- The network or cluster can contain only MiVoice Business systems.

## Limitations

RDN Synchronization is subject to the following limitations:

- You cannot distribute a directory entry to a specific list of elements. With RDN synchronization, SDS shares directory entries at the specified sharing scope. All elements within the specified data-sharing scope, share the directory entries.

- By default, non-prime DNs will be hosted on the same element as the associated set. For example, consider a set with DN 1111, hosted on element A. If the administrator programs button 3 to be a single line with DN 1112, then DN 1112 will default to being hosted on element A.

## Notable Features

RDN Synchronization differs from traditional telephony directory management in the following ways:

- By default, telephone directory entries are shared as General System Data at the "All 3300 ICPs" scope. You can edit any telephone directory entry from any element that is included in the SDS sharing scope assigned to the Telephone Directory.

- There are two new restrictions that apply to Telephone Directory form:

- If the directory number (DN) for an entry is a device DN, you cannot change it to a non-device DN (ARS string or group feature DN).

- If the DN for an entry is a non-device DN, you cannot change it to a device DN.

- An "Add" operation that you perform from the User and Services Configuration form always creates a new user entity, even if a user already exists with the same name.

- In forms that allow you to add or modify the directory name, such as the Telephone Directory form, the first name and last name can be up to 64 alphanumeric characters in length.

- The Remote Directory Numbers form becomes read-only and the Add, Change, and Delete buttons are no longer available in this form. View is available instead.

- The Departments and Locations forms do not display the Index column after the migration, so you can no longer search by Index number. However, you can search on department name or location in these forms when the system has been dimensioned to support large lists in the database.

- The list of forms in the SDS Form Sharing form is modified:

- The "General System" group of forms contains the Telephone Directory form.

- The "User Definition" group of forms contains entries for the following data: Departments, Locations, User and Services Configuration - User Attributes, User Authorization Profiles.

- "Service Hosting Data" is a new group of forms that allow the sharing of local-only directory numbers, hosted system data, and hosted user data.

- You can configure device resiliency from the User and Services Configuration form and IP Console resiliency from the IP Consoles form of the primary element.

- Simultaneous changes to data records are not shared via SDS. If two administrators perform changes on the same data record at the same time, shared updates will not be generated and the data record will be different on both systems.