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1. Using the DNS Manager, verify that the Lync 2010 Enterprise Pool Alias is pointing (therefore resolving) to the IP address of the hardware Load balancer machine as shown below.

   Caption 0 Figure 1 DNS Manager Image Modified

2. Verify that the VLAN interface used to communicate with the Lync server is tagged as indicted below.

   Caption 0 Figure 1 Tag VLAN Interface Image Modified

3. Verify that the F5 MGMT IP address is configured to use the VLAN interface set in the previous step.

   Caption 0 Figure 1 Verify Configuration Of F5 MGMT IP Address Image Modified

4. Verify that the VLAN interface Settings are configured as shown below.

   Caption 0 Figure 1 Verify Configuration Of VLAN Interface Settings Image Modified

5. Verify that Local Traffic > Nodes settings contain the Lync FE1, Lync FE2, and the virtual IP address of hardware load balancer machine as shown below.

   Caption 0 Figure 1 Verify Node Settings Image Modified

6. Verify that the settings found in Local Traffic > Pools contain the pools that the F5 load balancer listens to Lync on defined port numbers for various services as shown below.

   Caption 0 Figure 1 Verify Pool Settings Image Modified

   NOTE: the details of pool creation is explained in Deploying the BIG-IP LTM with Microsoft Lync Server 2010as shown below.

7. Verify the virtual server making use of the pools created above has itself been created as shown below.

   Caption 0 Figure 1 Verify Virtual Server Image Modified

Sonus SBC 2000 Configuration

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• Federated IP/FQDN: Pool FQDN in the IP/FQDN field
• Netmask: 255.255.255.255 in the Netmask field
  
  These fields allow the Sonus SBC 1000/2000 to receive SIP messages from the hardware load balancer HWLB. However, in order to receive/send SIP messages to/from Front End Servers, the Netmask field must be configured with a value of 255.255.255.0.

Call Flows

Using the Log Exchange utility, you can verify the F5 Hardware Load Balancer (HWLB) in action —

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The deployment in this article allows the following call flow in PSTN ph > Sonus SBC 1000/2000 > Lync client call direction.

LYNC client > Sonus SBC 1000/2000 > PSTN ph

The deployment in this article allows the following call flow in Lync client > Sonus SBC 1000/2000 > PSTN ph call direction.