firmware upgrade / phones

  1. Cannot Upgrade Firmware – Yealink SIP-T42S – 3CX Hosted V20

    Hello 3CX Support Team, I am experiencing an issue upgrading the firmware on my Yealink SIP-T42S phones on my 3CX Hosted V20 system. When I attempt to perform a firmware upgrade, I receive the following error: “Internal server error occurred. Please contact administrator.” Details of my...
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