This article describes the steps necessary to modify the
(SBC) configuration such that the SIP Transport is changed from TLS/SRTP (MTLS/SRTP) to TCP/RTP.
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PBX – SBC – Microsoft Lync 2010 configuration in place with MTLS/SRTP as SIP Transport |
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Image Modified |
Topology After
PBX – SBC – Microsoft Lync 2010 configuration in place with TCP/RTP as SIP Transport |
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Image Modified |
SBC Configuration Changes
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- 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.
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Panel |
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Caption |
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0 | Figure |
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1 | SIP Signaling Listen Port |
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- In the WebUI, click the Settings tab.
In the left navigation pane, go to Media > Media List > (relevant media list entry).
This is the Media List specified in the SIP Signaling Group above. |
Change the SDES-SRTP Profile to None as shown below.
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- 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.
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Panel |
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Caption |
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0 | Figure |
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1 | SIP Server Table After |
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Lync Changes (Topology Builder)
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- 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:
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