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You can change the certificate installed on the 

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system by obtaining the signed certificate from a Trusted CA or from a local Stand-Alone Windows Certificate Authority, and importing it as outlined in the instructions on this page.

Importing a Server Certificate

Before you begin

Before importing a new Signed Server Certificate, you must first import a valid Trusted CA Certificate.

If your node has a SHA-2 256 signed server certificate, the SBC will not interoperate with Lync 2010 or earlier OCS/Lync versions. The signature algorithm ( sha256WithRSAEncryption ) is shown in the Certificate panel of the
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SBC Certificate page in the UI.

SHA2-256 Certificate Compatibility

SHA2-256 CA Certificates may be used for the SBA, SBC, and Lync 2013 Servers. Lync 2010 requires that all devices employ ALL SHA1 Certificates. For more information see the Microsoft SHA1 Deprecation Policy.

  1. In the WebUI, click the Settings tab.

  2. In the left navigation pane, go to Security > SBC Certificates > SBC Edge Certificate.

    SBC Edge Certificate

Key Usage Field Descriptions

Enhanced Key Usage

This field displays the enhanced key usage regarding the purposes for which the subject's public key may be used.
TLS Web Server Authentication usage purpose is required in order to be compatible with some browsers.

Key Usage

Displays the key usage for defining the purposes of the key contained in the certificate.
Non-repudiation service purpose is disallowed in order to be compatible with some browsers.


To import an X.509 signed certificate:

  1. Select X.509 Signed Certificate from the Import menu at the top of the page.

    Import X.509 Signed Certificate

  2. Chose the import mode (Copy and Paste or File Upload) from the Mode pull-down menu.

    Import Mode

  3. If you chose File Upload:
    1. Use the Browse button to find the file
    2. Click OK.
  4. If you choose Copy and Paste:
    1. Open the file in a text editor.
    2. Paste the contents into the Paste Base64 Certificate text field.
  5. Click OK.

To import a PKCS12 Certificate and Key:

Importing PKCS12 Certificate Guidelines
  • The PKCS12 certificate must not be a chain, but only as the SBC certificate pair.
  • When importing a PKCS12 certificate, the Trusted CA certificates must be imported as a chain if there are both intermediate CA and root CA certificates.

  1. Select PKCS12 Certificate and Key from the Import menu at the top of the page.

    Import PKCS12 Certificate and Key

  2. Enter the password used to export the certificate in the Password field.

    Import PKCS12 Server Certificate

     

  3. Browse for the PKCS certificate and key file.

    You must use the same password as was used when exporting the certificate and key.

  4. Click OK

Verifying the Signed Server Certificate

Once you have imported the Signed Server Certificate:

  1. In the Issuer panel, ensure the Common Name field has changed from Self-Signed to the issuer's Common Name.
  2. In the Certificate panel,
    1. Ensure that the Enhanced Key Usage field indicates TLS Web Server Authentication.

    2. Ensure that the Verify Status field indicates OK.
      If the Verify Status field does not indicate OK, repeat the steps aboveto obtain a valid certificate.

      According to RFC3280, the Netscape CertType field is obsolete and has been replaced by the X509v3 Key Usage field.
      Most modern browsers require the Enhanced Key Usage field for certificate acceptance based on use purpose.

      Verify Signed Server Certificate

       

  • Server (
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    SBC 1000/2000) certificates with a 4096 RSA Key are not supported due to the amount of time required to generate a key and process calls.
  • Trusted Root CA certificates with a 4096 RSA Key are supported, but have not been thoroughly tested.
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