Lync Enterprise Voice / Lync 2013 Upgrade Proof of Concept

I have a client that is currently running Lync 2010 and using Cisco CUCM for voice. They use CUCILync for interfacing their phone and presence with Lync as well as soft phone.

They are considering migrating to Lync entirely for their voice platform. What I would like to do is setup a test group of users that use Lync entirely for voice. In addition to this we would also like to upgrade them to Lync 2013.

I realize these two things aren't necessarily one package but regardless of what they do relating to voice, they will almost certainly want to upgrade to Lync 2013.

I feel like the trickiest part of this process is how to implement a test group without causing disruption to the working environment. Has anyone ever done something like this or can point me in the direction of how to accomplish this? Please let me know if you need more information to assist me. Anything that anyone can give me on this would be greatly appreciated.
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Rob SandersAsked:
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Satyendra SharmaMicrosoft UC Technical ArchitectCommented:
I have done several Lync deployment with VoiP integration with different telephony providers in your case i would recommend below high level plan.

- Deploy Lync 2013 in parallel to 2010 deployment
- Integrate Lync 2013 with Cisco CUCM to provide Enterprise voice feature
- Move few test users from Lync 2010 to 2013, can continue using Lync 2010 or can start using 2013 client interface (i don't see any good reason to use 2010 client but depends on your environment)
- If everything goes fine start migrating users in batch
- Decommission Lync 2010 environment

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Rob SandersAuthor Commented:
You can have a Lync 2013 server and a Lync 2010 server deployed at the same time and not have any disruption or loss in functionality?
Satyendra SharmaMicrosoft UC Technical ArchitectCommented:
Yes that is the easiest migration option side-by-side... Looks like you will need to do some reading.

https://technet.microsoft.com/en-us/library/jj204696.aspx
https://technet.microsoft.com/en-us/library/jj205369.aspx
Rob SandersAuthor Commented:
Thanks a lot. That is very helpful advice and those are very helpful Links.
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