Voice Resiliency in Lync Server 2010

Voice Resiliency in Lync Server 2010
Justin Morris
UC Consultant (and Australian)
@jm_deluxe
www.justin-morris.net
justin@justin-morris.net

What’s your story?
Have you deployed Lync already?
Connected OCS/Lync to the PSTN before?
Know what a SIP 301 Redirect is?
Know what SDP and RTCP is?
Don’t know what I’m talking about? 

New Resiliency Features in Lync
DNS Load Balancing
Lync client caches front end IP addresses.
FEs balance users across servers.
HLB only for HTTP traffic.
Registrar Service on each Front End Server.
Backup Registrar.
Limited Functionality Mode in Lync.

Business Requirements
Determine them!
Know what it is your organisation wants
Is it productivity gains? Cost savings?
Work out what features of Lync you will deploy.
What level of availability/recovery do you require?
In short - do the necessary due diligence.

What technical solutions are available?
Within, and for your Central Site
Enterprise Edition Front End Pool
Metropolitan Data Centre Resiliency
Backup Registrar
For your Branch Sites
Survivable Branch Appliance (SBA)
Survivable Branch Server (SBS) + Gateway
Standard Edition Server + Gateway

Resiliency within your Central Site
Enterprise Edition Front End Pool
Up to 10 Front End servers
AV Conferencing Server Role can be split out for greater scalability
Backend on SQL 2005-2008 R2 Cluster
Problem: snom phones don’t like EE pools because they can’t understand DNS load balancing

Resiliency within your Central Site

Resiliency for your Central Site
Backup Registrar
Requires a Standard Edition server allocated as a Backup Registrar for a pool in Topology Builder.
Secondary DNS SRV records must be created.
Client gets “limited functionality mode”.

Metropolitan Data Centre
The most difficult to deploy and manage.
Requires:
Stretched VLAN across sites.
Stretched SQL 2008/2008 R2 cluster.
Synchronous data replication.
<20 ms latency between sites.
Global hardware/DNS load balancing.

Branch Site Resiliency
Survivable Branch Appliance (SBA).
1 RU chassis running Windows and Lync.
Has ISDN E1 ports in it for PSTN connectivity.
Made by hardware vendors.
For 25 - 1000 users.
Has no conferencing capability.
Just Registrar and Mediation services.
Users are homed on this pool (server).

Branch Site Resiliency - SBA

Survivable Branch Server (SBS) + Gateway.
A Windows server you deploy.
For 1000 - 5000 users.
Has no conferencing capability.
Just Registrar and Mediation services.
Users are homed on this pool (server).

Branch Site Resiliency - SBS

Standard Edition Server + Gateway
A Windows server you deploy.
For greater than 5000 users.
Does have full conferencing capability i.e. MCUs.
Users are homed on this server.

Branch Site Resiliency – SE Server

Conclusion
Know what your existing IT environment is capable of.
Engage your voice, network, security and server teams WELL in advance.
Ensure you understand your voice resiliency requirements and select a solution accordingly.
Enjoy the ride and the awesomeness. 

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Voice Resiliency in Lync Server 2010

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