Lync router configuration for MI424WR Router

Question

Has anybody gotten the router port forwarding configuration to work for Microsoft Lync?  I can hear everybody on Lync but nobody can hear me.  I've followed the recommendations from Microsoft as much as I can figure on adding the port forwarding information but it's still not working.

Answer 1

-->NAT the current public IP to the internal IP of the 2 new CAS server (which also got the HT
role installed),
You should NAT 2 internal IPs of the (CAS servers) to 1 external IP. Add these CAS servers as the source
servers in the send connector.
-->Internally, I would need to update the CASArray DNS record (currently pointing to old CAS server) to
point to the WNLB virtual IP
This is correct
Configure send connector to use external DNS for dns lookup
Go to send connector properties and tick "use the external dns lookup settings on the transport
server" and add external DNS IPs in your transport server properties using this command.
Set-TransportServer Hub01 -ExternalDNSAdapterEnabled $false -ExternalDNSServers {192.168.1.1, 192.168.1.2}
You may face some unknown issues depends on how you maintain. 
I had one issue long back in exchange2007 CCR with NLB. I
was clearing the DNS cache every1-2 days due to email delay.
Final I gave them a script to clear the DNS cache.