This document discusses voice resiliency features in Lync Server 2010 including: 1) New resiliency features such as DNS load balancing and backup registrar functionality to balance users across front end servers and provide limited functionality in the event of an outage. 2) Technical solutions for resiliency within a central site including front end server pools and backup registrars, and for metropolitan areas using data center replication. 3) Branch site resiliency options such as survivable branch appliances, survivable branch servers plus gateways, and standard edition servers with gateways.

1. Voice Resiliency in Lync Server 2010Justin MorrisUC Consultant (and Australian)@jm_deluxewww.justin-morris.netjustin@justin-morris.net

2. What’s your story?Have you deployed Lync already?

3. Connected OCS/Lync to the PSTN before?

4. Know what a SIP 301 Redirect is?

5. Know what SDP and RTCP is?

6. Don’t know what I’m talking about? New Resiliency Features in LyncDNS Load Balancing

7. Lync client caches front end IP addresses.

8. FEs balance users across servers.

9. HLB only for HTTP traffic.

10. Registrar Service on each Front End Server.

11. Backup Registrar.

12. Limited Functionality Mode in Lync.Business RequirementsDetermine them!

13. Know what it is your organisation wants

14. Is it productivity gains? Cost savings?

15. Work out what features of Lync you will deploy.

16. What level of availability/recovery do you require?

17. In short - do the necessary due diligence.What technical solutions are available?Within, and for your Central Site

18. Enterprise Edition Front End Pool