Topic Last Modified: 2012-09-25

The following are guidelines and best practices to consider when you deploy Enterprise Voice:

Important:
Exchange Unified Messaging (UM) supports IPv6 only if you are also using UCMA 4.

Deploying Redundant Exchange UM Servers

Important:
We recommend that you deploy a minimum of two servers on which Exchange UM services is running for each Exchange UM SIP URI dial plan that you configure for your organization. In addition to providing expanded capacity, deploying redundant servers provides high availability. In the event of an server failure, Lync Server 2013 can be configured to fail over to another server.

The following example configurations provide Exchange UM resiliency.

Example 1: Exchange UM Resiliency

Exchange UM Example 1

In Example 1, Exchange UM servers 1 and 2 are enabled in the Tukwila data center, and Exchange UM servers 3 and 4 are enabled in the Dublin data center. In the event of an Exchange UM outage in Tukwila, the Domain Name System (DNS) A records for servers 1 and 2 should be configured to point to servers 3 and 4, respectively. In the event of an Exchange UM outage in Dublin, the DNS A records for servers 3 and 4 should be configured to point to servers 1 and 2, respectively.

Note:
For Example 1, you should also assign one of following certificate on each Exchange UM server:
  • Use a certificate with a wildcard in the Subject Alternative Name (SAN).

  • Put the fully qualified domain name (FQDN) of each of the four Exchange UM servers in the SAN.

Example 2: Exchange UM Resiliency

Exchange UM Example 2

In Example 2, under ordinary operating conditions Exchange UM servers 1 and 2 are enabled in the Tukwila data center, and Exchange UM servers 3 and 4 are enabled in the Dublin data center. All four servers are included in the Tukwila users' SIP URI dial plan; however, servers 3 and 4 are disabled. In the event of an Exchange UM outage in Tukwila, for example, Exchange UM servers 1 and 2 should be disabled and Exchange UM servers 3 and 4 should be enabled so the Tukwila Exchange UM traffic will be routed to the servers in Dublin.

For details about how to enable or disable Unified Messaging on Exchange 2013, see “Integrate Exchange 2013 UM with Lync Server” at http://go.microsoft.com/fwlink/p/?LinkId=265372.

For details about how to enable or disable Unified Messaging on Microsoft Exchange Server 2010, see:

See Also