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Updated 8 Oct 2026

CAPTCHA

RTS
ETS

This subsection enables additional SMS spam protection using CAPTCHA.

Parameter Description
Enable Turns CAPTCHA checking on.
Provider Select an external provider for the CAPTCHA feature.
  • Yandex Captcha. Currently this is the only supported Captcha provider.
⚠️ For Captcha to work and allow phone number login, client devices must have access to particular resources.
Invisible Captcha If checked, verification is only requested if suspicious activity is detected.
Client/Server key Enter API tokens from the provider.
Trusted nets Enter IP addresses for which the check will be disabled. You can use mask via /. Example: 192.168.0.123, 10.129.0.0/16.

Configuration details are available in the administrator documentation.