Password Reset Server supports a third party called ProxStop to provide phone verification via phone call or SMS. To use ProxStop with the "Multifactor - Phone" or “Multifactor - SMS” questions, you will need to sign up for an account with ProxStop. ProxStop charges approximately $0.12 per call or SMS to a phone number in the United States. ProxStop also supports calls to other countries ( see their rates).
Next steps:
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Sign up for a ProxStop account
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Get your API Key from ProxStop (under their "API Services" section)
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Add them to Password Reset Server (Administration | Configuration)
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Add a "Multifactor - Phone" and/or “Multifactor - SMS” question to your Security Policy
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