Lync Server 2013 Front End Pool Mediation Service only works on one node

Hello, I'm currently experiencing an interesting issue with a Lync 2013 Front End Pool implementation on a customer, and I don't know if this is by design or am I missing something.
We implemented 3 Enterprise Front End Servers in a Pool with a hardware load balancer and we have them configured also as a mediation Pool.
We have a SIP trunk to an Avaya PBX which was perfectly working before on a Lync 2010 Implementation that we migrated to these new 2013 Front End Pools.
Now the SIP traffic is only working when configured directly to one node of the pool. If we configure it to any other node the calls fail. We also tried configuring the HLB for port 5060 for the pool and pointed the PBX to that IP but the calls also fail.
Searching around I read something about that the PBX has to be Lync certified in order to use DNS load balancing to send SIP traffic to the mediation pool, however, I don't think DNS load balancing will work because the other nodes doesn't connect the calls
from the PBX, only one node appears to be listening for the SIP Trunk.
I also restarted the mediation service on one  non-working mediation server node and the event viewer on the working mediation server node showed events that it restarted the service, Not the non-working one, it's like only one server from the pool
is doing as mediation server. 
So even if I get a Lync Certified PBX/Media Gateway, the mediation service doesn't appear to be load balanced, or how does it work in order to do that?
Thanks.
Eduardo Rojas

Just a few things about what should be happening.  Each front-end server should be listening on the port configured in topology builder for the mediation service. So if that is port 5060, verify that you see that port listening on all front-end servers
by running a netstat -ano.  From a local workstation, also make sure you can connect to that port via a telnet IPAddress 5060.  As you say, you should be able to send any of the three mediation servers an inbound call.
Outbound calls will round robin out of the enterprise pool.  So you shouldn't see all of the calls coming out of a single server.
A few other items I would look into:
- Make sure your ports are right.  Ensure that you are matching ports on the Avaya and Lync.  It's not a hard requirement but makes life easier to troubleshoot.  So if the Avaya is 5060, just make sure TCP/5060 enabled in your mediation pools
and that your gateways/trunks are also set to TCP/5060.
- Look outside the Lync Event Viewer and see if anything strange (.net errors) are being tossed anywhere else during startup of the mediation service.  I once had to remove the mediation server installer (Program and Features | Remove) and rebootstrap
the server because something went sideways during an install.
Thanks,
Richard
Richard Brynteson, Lync MVP | http://masteringlync.com | http://lyncvalidator.com

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    http://msucmenow.blogspot.in/2013/05/troubleshooting-lync-2013-pool-pairing.html
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    Log Name:      Lync Server
    Source:        LS Backup Service
    Date:          1/21/2014 8:02:33 AM
    Event ID:      4073
    Task Category: (4000)
    Level:         Warning
    Keywords:      Classic
    User:          N/A
    Computer:      ABC.net
    Description:
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    ItemId: 1b3be172-b121-43cf-bd4e-b3d368eae6a9, DocId: 7972, DocName: urn:hcd:[email protected]
    ItemId: 1b3be172-b121-43cf-bd4e-b3d368eae6a9, DocId: 7973, DocName: urn:lcd:[email protected]
    ItemId: 1b3be172-b121-43cf-bd4e-b3d368eae6a9, DocId: 7974, DocName: urn:upc:[email protected]
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    OverallExportStatus : SteadyState
    OverallImportStatus : ErrorState
    BackupModules       : {UserServices.PresenceFocus:[SteadyState,ErrorState],
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    Source:        LS Backup Service
    Date:          1/21/2014 9:37:47 AM
    Event ID:      4069
    Task Category: (4000)
    Level:         Warning
    Keywords:      Classic
    User:          N/A
    Computer:     SQL1.net
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    Source:        LS Backup Service
    Date:          1/21/2014 9:52:45 AM
    Event ID:      4064
    Task Category: (4000)
    Level:         Warning
    Keywords:      Classic
    User:          N/A
    Computer:     SQL1.net
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    Praveen | MCSE Messaging 2003

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    http://technet.microsoft.com/en-us/library/jj204773.aspx
    Lisa Zheng
    TechNet Community Support

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