Which websites in China are using voice verification codes? Is there any company with mature language verification code technology in China?

For example: btc China, Bitter, etc. Other colleagues said that many websites use this form of verification code because the short message cannot be sent because of the delay. As for whether the voice verification code technology is mature, I personally think it is a very mature technology. The functions of voice verification code are VoIP, ivr outbound call, TTS and other very mature technologies.

Application:

The appearance of voice verification code will solve these problems. As long as the user's mobile phone or landline can answer the phone normally, they can receive the voice verification code, which can realize automatic voice broadcast, and can also send short messages to the user's mobile phone to ensure double insurance.

If the phone is turned off when answering or dialing, the system will automatically replay it after the phone is normal, so as to ensure that your website users or members can receive the verification code, so that users can better experience the target website and help improve the satisfaction and popularity of the website.

The appearance of voice verification code provides a better solution to the problem that verification code is unstable and often unavailable for a long time, which brings users to the website, simpler and more efficient operation to the website administrator and better user experience.