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This article describes the steps necessary to configure the Sonus SBC 1000/2000 with

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 with an F5 Networks load balancer in a PBX-Sonus SBC 1000/2000
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-Microsoft Lync
topology as illustrated below:

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  • 2x Microsoft Lync 2010 front end servers
  • 1x F5 Networks hardware load balancer
  • 1x Meridian PBX
  • 1x Sonus SBC 1000/2000 Gateway
  • 1x 
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(info)

For the purpose of this article we assume that the F5 load balancer is already installed, configured, and successfully integrated with Lync 2010.

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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.

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    1DNS Manager

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

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    1Tag VLAN Interface

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

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    1Verify Configuration of F5 MGMT IP Address

     

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

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    1Verify Configuration of VLAN Interface Settings

     

  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.

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    1Verify Node Settings

  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.

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    1Verify Pool Settings

     

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

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    1Details of Pool Creation

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

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    1Verify Virtual Server

Sonus SBC 2000 Configuration

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 Configuration

The

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 configuration for deployment in this topology requires the following fields to be configured:

  • 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
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     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.

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

PSTN ph >

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> Lync client

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

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 > Lync client call direction.

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1PSTN ph > Lync Client Call Flow

 

LYNC client >

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 > PSTN ph

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

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 > PSTN ph call direction.

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1Lync Client > PSTN ph

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