Network Ports requirements in Enterprise Lync Infrastructure with DR

Question

Hello,
We are in process of Lync Server 2013 enterprise deployment where all the workloads will be used. We have two distinct datacenters representing two different sites. Below is the infrastructure information
Single Forest
ContoBill.Com
Empty root domain with three child domains
Users.contobill.com
Resources.contobill.com
Staging.contobill.com
Two AD Sites Default and DR both of them will have DC/GC/DNS for all the domains
Physically we have three tier architecture
Two Datacenters both are identical, details below
Tier1: DMZ that will host the servers that are not in domain and are used for internet gateways like Edge, Proxy etc
Tier2: Internal network (intranet) that will host the database servers and applications
Tier3: Internal network (Intranet) that will host Exchange, SharePoint and Lync
Each tier is a different IP subnet and there is a firewall between each of them, and also there is a firewall between the datacenters as well.
I have following questions in order to plan the lync deployment in highly available environment and maintain supportability.
Q1. Does Microsoft support having firewall between a pool pair, the pool is active/passive and will be utilized only in case of disaster recover.
Q2. If this scenario in Q1 is supported what are the required ports that are required to be opened on the network firewall. In order to successfully synchronize between the pairs
Q3. Does Microsoft support having a firewall between the frontend and backend servers, if yes what are the required ports to be opened on the network firewall

Answer 1

You can find all the Ports and Protocols required by all Lync components at http://technet.microsoft.com/en-us/library/gg398833.aspx
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