Polycom RealPresence 800s Administrator's Manual page 657

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10 If not selected by default, change the Transport Type to TLS.
11 If you are using the CSR method, and the CSR option is not selected by default, change
Polycom, Inc.
Click the SIP Servers tab.
In the SIP Server, select Specify.
In the SIP Server Type, select Microsoft.
Enter the IP address of the Office Communications Server 2007 or Lync Server 2010 and
the Server Domain Name as defined in the OCS/Lync Server and in the Management
Network for the DNS.
The Create Certificate and Send Certificate buttons are enabled.
the Certificate Method to CSR.
If you are using the PFX method, in the Certificate Method field select PEM/PFX.
At this point the procedure changes according to the selected certificate method.
If you have selected PEM/PFX, skip to step 27 on page I-15.
Appendix I-Setting the Collaboration Server for Integration Into Microsoft Environment
I-11