Load Balancing Using Site Default Device Pool
---------------------------------------------

A default device pool is created for each site when the site dial plan is
deployed for the Type 1 through 4 dial plan schema groups. This procedure uses
the default site device pools, so you do not need to create any additional device
pools directly on Cisco Unified Communications Manager (Unified CM). Perform this
procedure to load balance using the default site device pool. In this procedure,
the default device pool is updated to point to the appropriate Cisco Unified
Communications Manager group.

.. note::

   Using this configuration, redundancy is gained within a site while load
   balancing is gained across multiple sites. Since there is one device pool
   per site, all devices at a site home to the same sequence of Cisco Unified
   Communications Managers, providing failover redundancy. Devices in different
   sites home to different sequences of Cisco Unified Communications Managers,
   providing load balancing across the sites.
   
   The default site device pool is not created until the Type 1 to 4 site dial
   plan has been deployed which updates the Site Defaults to use the default
   device pool. If the site dial plan has not been deployed, you will not see a
   site default device pool in the form Cu<customerId>Si<siteId>-DevicePool. You
   can determine the default device pool for a site in VOSS-4-UC by choosing
   **Site Management > Defaults**.

Procedure
.........

1. Log in as provider, reseller, or customer administrator.
2. Choose the site from the hierarchy node breadcrumb at the top of the
   view in (VOSS-4-UC).
3. Follow the steps outlined in Create a Site Dial Plan if you have not
   already done so; the Create a Site Dial Plan procedure creates the
   default site device pool instance.
4. Log in to Cisco Unified Communications Manager and create one or more
   Cisco Unified Communications Manager groups on Cisco Unified Communications
   Manager. See Cisco Unified Communications Manager Administration Guide.
5. From VOSS-4-UC, perform a sync operation of the Cisco Unified Communications
   Manager using the **Administration Tools > Data Sync** menu path. This sync updates
   the VOSS-4-UC cache and makes the Cisco Unified Communications Manager groups
   that were added directly on Cisco Unified Communications Manager available to
   VOSS-4-UC.
6. Perform Associate Cisco Unified Communications Manager Group to a Device Pool,
   choose a Unified CM group other than the default group in the **Call Manager
   Group** drop-down list.

   Note:

   To verify that the phone or subscriber uses the device pool as expected, choose
   a subscriber from the list of subscribers in VOSS-4-UC
   (**Subscriber Management > Subscribers**) and choose the required **Device Pool
   Name** setting from the drop-down under the **Phones** tab.