This article describes the steps necessary to modify the SBC Edge (SBC) 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 – SBC – Microsoft Lync 2010 configuration is in place already with MTLS/SRTP as SIP Transport.
The process requires changes on both the SBC and on the Lync Server. The six steps to accomplish the change are:
- Edit the appropriate Signal Group on the SBC.
- Edit the appropriate Media List on the SBC.
- Edit the appropriate SIP Server Table on the SBC.
- Edit the port and protocol settings on the Lync Server.
- Publish the altered topology
- Stop/Restart the Lync Mediation Server service.
Topology Before
PBX – SBC – Microsoft Lync 2010 configuration in place with MTLS/SRTP as SIP Transport |
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![](/download/attachments/203327595/T1-%20SRTP%20to%20TCP%20-%20RTP.png?version=1&modificationDate=1574859296000&api=v2)
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Topology After
PBX – SBC – Microsoft Lync 2010 configuration in place with TCP/RTP as SIP Transport |
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![](/download/attachments/203327595/T1-%20SRTP%20to%20TCP%20-%20RTP2.png?version=1&modificationDate=1574859296000&api=v2)
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SBC Configuration Changes
SIP Signaling Group
- In the WebUI, click the Settings tab.
- In the left navigation pane, go to Signaling Groups > (relevant SIP Signaling Group).
- Change the Listening Ports configuration to 5068, as shown below.
Change the TLS Profile ID to N/A.
SIP Signaling Listen Port
- In the WebUI, click the Settings tab.
In the left navigation pane, go to Media > Media List > (relevant media list entry).
Change the SDES-SRTP Profile to None as shown below.
SIP Server Table
- In the WebUI, click the Settings tab.
- In the left navigation pane, go to SIP > SIP Server Tables >(relevant SIP Server Table Entry).
- Change the Port value to 5068, as shown below.
Change the Protocol value to TCP, as shown below.
Lync Changes (Topology Builder)
PSTN Gateway Properties Change
- Log into the Lync front end server PC.
- Launch the Lync Server 2010 Topology Builder.
- In the Navigation Tree, go to Branch Sites > PSTN gateways > (relevant SBC entry).
- Right-click the relevant SBC.
- Select Edit Properties...
- Change the Listening Port for IP/PSTN gateway to 5068.
- Change the SIP Transport Protocol to TCP.
Click OK.
Publish Topology
To publish the topology:
- In the Topology Builder navigation tree, right-click Lync Server 2010.
Select Publish Topology....
- Launch the Lync Server 2010 Configurationpage
- In your brorwser, go to (the FQDN of the front end pool//cscp).
- Select the *Mediation Server in the Service list.
- Select Stop service from the Action drop-down list, as shown below.
Select Start service from the Actiondrop-down list, as shown below.
Lync Mediation Server Service Restart