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Configuring Trusted SSL Certificates for Zoom Phone

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Introduction

Purpose: Teach the User how to create, upload, and provision SSL certificates so that Mitel phones can successfully register against Zoom Phone over TLS 1.2. This is a requirement for Zoom Phone Service.

Supported Devices: This solution is applicable to all Mitel devices supported in Phonism.

Creating a Mitel-Compatible Certificate for Zoom Phone

  1. Download SSL Certificates: Download the following SSL Certificates from Zoom Phone's Knowledge Base:

    1. DigiCert Global Root CA

    2. DigiCert Global Root G2

    3. DigiCert TLS RSA4096 Root G5.

  2. Combine Certificates: Open a text editor and combine the content of each of the three .pem files you downloaded into a single file. Save this file with a memorable name like zoom_phone_trusted_certs.pem.

    1. Your combined file will look something like this

    2. -----BEGIN CERTIFICATE-----
MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh
...
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIDjjCCAnagAwIBAgIQAzrx5qcRqaC7KGSxHQn65TANBgkqhkiG9w0BAQsFADBh
...
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIFZjCCA06gAwIBAgIQCPm0eKj6ftpqMzeJ3nzPijANBgkqhkiG9w0BAQwFADBN
...
-----END CERTIFICATE-----

  3. Upload Certificate File in Phonism: In Phonism, navigate to the Resources > Assets tab and Add Certificate File to upload your newly created .pem file.

  4. Configure Devices for Retrieval: Once uploaded, you can configure your devices to retrieve this file from Phonism when provisioning.

    1. Configure Mitel Phone or Template:

      1. Set the following setting in either the Phone or Template Custom Configuration: sips trusted certificates: {{zoom_trusted_cert_pem}}.

      2. Replace {{zoom_trusted_cert_pem}} with the {{tag}} corresponding to your newly uploaded certificate.

      3. This Tag can be found when editing a configuration value in Phonism and selecting the Variables submenu.

      4. This Tag has a pattern of {{AUX.filename.pem}}. Thus, if you named your file zoom_phone_trusted_certs.pem, your tag would look like {{AUX.zoom_phone_trusted_certs.pem}}.

      5. Hit save on the Phone or Template to commit your changes.

Troubleshooting and Common Errors

Troubleshooting Tip: If you're experiencing trouble registering with Zoom Phone on your Mitel Phone, ensure that your NTP time servers are configured correctly.

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