Voice OTP settings
Voice providers are used to send voice OTPs. There are two options for sending voice messages:
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Default—No Voice OTP gateway. However, Voice OTP settings are inherited from the parent Virtual Server if they are configured. 
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Custom—Select this option to configure the Virtual Server to send voice messages via a service provider to which you have subscribed. You can verify the ability to send voice messages by entering the phone number of a device capable of receiving voice messages in the Sender's Phone Number field. 
Prior to configuring SAS, configure a custom voice provider. The voice provider that you configure applies to the organization and its sub-organizations.
You can also customize the voice OTP messages that the Virtual Server sends.
Configure SAS to use a custom voice provider
To configure SAS to use a custom voice provider:
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On the SAS console, select Comms > Communications > Voice OTP Settings.  
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Select Custom.  
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Provide the details about the voice provider that you are using: - 
Voice Provider—Twilio. 
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Account Id—Provided by Twilio. 
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Authentication Token—Provided by Twilio. 
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Sender's Phone Numbers—Provided by Twilio. The numbers from which you will receive calls. Phone numbers must contain digits only and must begin with a country code. 
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Delay between messages (ms)—The delay between calls in milliseconds. The only voice provider supported is Twilio. Refer to Twilio for details. 
 
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Select Apply. 
Recommended settings
The recommended settings are:
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SMS template in Challenge Response mode 
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Numeric PIN's only (complex PINS are not supported) 
Related information
Other tasks related to the Voice OTP feature include: