Exchange 2010 Unified Messaging : PART II

High Availability for Unified Messaging servers

The telephony system is frequently business-critical so it must be highly available to users. The UM system should be solid in order to provide services to users when a key component, for example a UM server or a IP gateway becomes unavailable. The UM worker process can deal with outages in Mailbox servers, Hub Transport servers and domain controllers.
Exchange Server 2010 Unified Messaging itself can be made high available by installing different UM servers in the environment and spread the UM users throughout your enterprise. The IPBX  systems/ VoIP gateways load balance their requests to the different UM servers. In order to allow a 1 server failure, 2 servers are placed in each datacenter for redundancy. High availability is simply extended by adding extra UM servers. There is no need for complex clustering.
The UM server has a IP gateway list that contains  the IP gateways associated with the UM server’s dial plan. The UM servers load balance their connections to these IP gateways.br/>

Message Waiting Indicator (MWI)

With the new Message Waiting Indicator each unified messaging user is notified of new or unread voice mails by a lighting lamp. In addition it provides a counter on their individual supported desk phone that is integrated into your Unified Messaging Infrastructure, too. In addition it can configure your mailbox to receive a SMS notification with the number of new voice mails and – if you want to – the mail preview in this SMS, too.br/>

Language support

With Exchange Server 2010 Unified Messaging users can now listen and interact with their messages within their own native language.br /> br /> br/>