What should be the cause and how to solve it?

I use the S705 Phone connected wiht the extension module, but today I found a problem that th numpad of the s705 do not response. When I tried pressing the numpad, they don’t response and ther is no number shown on a screen, but for the soft button of extension module, it still works very well

What should be the problem? and how can I solve it?

  1. Change firmware to the latest (or one version back). Phone Firmware Release Notes - Phones - Documentation (freepbx.org)

  2. Contact the vendor for support. Support - Sangoma Technologies

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