We are very proud to announce that the new firmware update version of the S-Series VoIP PBX has been released with a new powerful feature, great optimization, and bug fixes. The much-anticipated API feature is finally available, and via API the third-party applications can get Yeastar IPPBX information and make secondary development on the applications. This new version also brings enhanced security mechanism, so we strongly recommend that you upgrade the firmware as soon as possible.

See what’s new in the firmware version


  1. Added API feature: third-party applications can get IPPBX information via the API. This feature is supported in S50, S100, S300.

Related: [Blog] What You Can Achieve with S-Series VoIP PBX API 


  1. Reduced background noise when playing system prompts and global recording in Linkus Mobile Clients.
  2. Optimized Web interface login security: after five unsuccessful login attempts in the Web interface, instead of locking the account for 10 minutes, the IP address will be added into the firewall blocklist.
  3. Optimized extension registration security: when failed to register extension using the same IP address for five times in five minutes, the IP address will be added into the firewall blocklist.


  1. Fixed Attended Transfer issue on Linkus Mobile Client: when Linkus Mobile Client user A (extension A) made an outbound call through the GSM trunk, and transferred it to the extension B during the call using the “Attended Transfer” feature, then user A pressed the “Transfer” button before extension B could press the “Answer”, the call would be hung up.
  2. Fixed the issue that DTMF on Polycom Phones did not take effect.
  3. Fixed the issue that when administrator sent emails containing a QR code for users to log in their Linkus Mobile Client account, some emails would display garbage characters.

Download the firmware or check for new update in your S-Series VoIP PBX Web interface. For more details, please refer to the Release Note.

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