Topic Last Modified: 2010-12-13
The ExUM Routing application runs on the Front End Server to route calls, either to an on-premises Microsoft Exchange Server Unified Messaging (UM) deployment or to hosted Exchange UM.
The ExUM Routing Application
The Lync Server 2010 ExUM Routing application uses information from user account settings and from hosted voice mail policy parameters to determine how to route calls for hosted voice messaging, as shown in the following diagram.
Exchange UM routing can be configured to route calls to users who are enabled for on-premises Exchange UM, to users who are enabled for hosted Exchange UM, or to a combination of the two.
For example, suppose that Roy’s mailbox and Exchange UM service are homed in an on-premises Exchange deployment.
- The proxy address information from Roy’s user account provides
the information that the ExUM Routing application uses to route his
calls to an on-premises Exchange UM server.
Alice’s mailbox and Exchange UM service are located at a hosted Exchange service provider’s data center. Routing for her Exchange UM calls is configured as follows:
- The values set in the msExchUCVoiceMailSettings attribute of
Alice’s user account tell the ExUM Routing application to check for
routing details in a hosted voice mail policy.
Note: The value of the msExchUCVoiceMailSettings attribute can be set by either the Exchange service provider or the Lync Server administrator. In the example shown in the preceding diagram, the value (CsHostedVoiceMail=1) was set by the Lync Server administrator to enable hosted voice mail for Alice. For details about this attribute, see Hosted Exchange User Management.
- The hosted voice mail policy that is assigned to Alice’s user
account provides routing details:
- Destination is the hosted Exchange UM service provider
(ls.ExUm.<hostedExchangeServer>.com in this
- Organizations are identified by the tenant IDs, which are the
routing FQDNs for SIP messages for Exchange Server tenants that are
located on ls.ExUm.<hostedExchangeServer>.com
(corp.contoso.com and corp.litwareinc.com in this example).
For details, see Hosted Voice Mail Policies.
- Destination is the hosted Exchange UM service provider (ls.ExUm.<hostedExchangeServer>.com in this example).
|If both the msExchUCVoiceMailSettings attribute and the UM proxy address settings are present in a user account, the msExchUCVoiceMailSettings attribute takes precedence.|