This documentation relates to SBC (UX) 1000/2000 Release 2.0.x
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This article describes the steps necessary to modify the UX configuration such that the SIP Transport is changed from TLS/SRTP (MTLS/SRTP) to TCP/RTP.

For the purposes of this article it is assumed that PBX – UX – Microsoft Lync 2010 configuration is in place already with MTLS/SRTP as SIP Transport. This particular UX2000 configuration is explained in UX configuration for Deployment in PSTN - UX - Microsoft LYNC 2010 Setup.

The process requires changes on both the UX and on the Lync Server. The six steps to accomplish the change are:

  1. Edit the appropriate Signal Group on the UX.
  2. Edit the appropriate Media List on the UX.
  3. Edit the appropriate SIP Server Table on the UX.
  4. Edit the port and protocol settings on the Lync Server.
  5. Publish the altered topology
  6. Stop/Restart the Lync Mediation Server service.

Topology Before

PBX – UX – Microsoft Lync 2010 configuration in place with MTLS/SRTP as SIP Transport

Topology After

PBX – UX – Microsoft Lync 2010 configuration in place with TCP/RTP as SIP Transport

UX Configuration Changes

SIP Signaling Group

  1. In the WebUI, click the Settings tab.
  2. In the left navigation pane, go to Signaling Groups > (relevant SIP Signaling Group).
  3. Change the Listening Ports configuration to 5068, as shown below.
  4. Change the TLS Profile ID to N/A.

Media List

  1. In the WebUI, click the Settings tab.
  2. In the left navigation pane, go to Media > Media List > (relevant media list entry).
    (info) This is the Media List specified in the SIP Signaling Group above.
  3. Change the Crypto Profile ID value to None as shown below.

SIP Server Table

  1. In the WebUI, click the Settings tab.
  2. In the left navigation pane, go to SIP > SIP Server Tables >(relevant SIP Server Table Entry).
  3. Change the Port value to 5068, as shown below.
  4. Change the Protocol value to TCP, as shown below.

Lync Changes (Topology Builder)

PSTN Gateway Properties Change

  1. Log into the Lync front end server PC.
  2. Launch the Lync Server 2010 Topology Builder.
  3. In the Navigation Tree, go to Branch Sites > PSTN gateways > (relevant UX entry).
  4. Right-click the relevant UX.
  5. Select Edit Properties...
  6. Change the Listening Port for IP/PSTN gateway to 5068, as shown below.
  7. Change the SIP Transport Protocol to TCP, as shown below.
  8. Click OK.

Publish Topology

To publish the topology:

  1. In the Topology Builder navigation tree, right-click Lync Server 2010.
  2. Select Publish Topology....

Lync Mediation Server Service Restart

  1. Launch the Lync Server 2010 Configuration page
    1. In your brorwser, go to (the FQDN of the front end pool//cscp).
  2. Select the *Mediation Server in the Service list.
  3. Select Stop service from the Action drop-down list, as shown below.
  4. Select Start service from the Action drop-down list, as shown below.