Change SSL and TLS Version

This topic describes how to change SSL and TLS version used on the Yeastar K2 IPPBX.


  1. Log in to PBX web interface, go to Settings > System > Security > Service.
  2. In the drop-down list of System Security Level, select a type to change the SSL and TLS version.
    • High Level: The system only supports TLS 1.2 protocol.
      Note: We recommend that you select High Level to ensure secure communication over network.
    • Low Level: The system only supports TLS 1.0, TLS 1.1, TLS 1.2, and SSL 3.0 protocols.
      Note: If users wants to access the PBX via a web browser or a 3-rd party software, which doesn't support TLS 1.2 protocol, select Low Level.
  3. Click Save.


The web browser or the 3rd-party software needs to enable the same version of TLS/SSL before they can access the PBX.