Clerk MFA
Clerk’s Multi Factor Authentication or OTP app supports both Virtual and Non-VoIP phone numbers for SMS verification from all major online platforms.
Clerk’s Two Factor Authentication (or Multi-Factor) Authentication (MFA) app allows you to receive verification codes from any online service. Clerk supports both virtual and non-voip phone numbers. Use clerk on any website and speed up login with your partners and employees by receiving one time passwords and verification codes.
Features:
  • Online SMS Verification
  • Shared Multi-factor Authentication
  • Use Numbers on Any Website
  • Create Unlimited Numbers
  • Receive Verification Codes in Seconds in:
    • Slack
    • Email
    • Webhook
    • Phone number

Virtual Phone Numbers

A VoIP number, also known as Voice over IP number, is a virtual phone number that works with most of online services to receive one time passwords (OTP), but not all. A number of services can work with a virtual phone number via voice transcription.
Note: By default when you provision a Clerk phone number in Slack you get assigned a virtual phone number.

Non VoIP (Real) Phone Numbers

Non-VoIP or Real phone numbers are usually required by highly sensitive websites such as banks, Facebook, Linkedin... This type of phone number will work with ALL online services.
All Clerk Non VoIP numbers are USA based real phone numbers that will work with ALL online services.
To enable a non-voip number on your account please reach out to [email protected]
Limitations of Non VoIP Numbers: These types of phone numbers are designed for receiving verification codes only. The numbers are only able to receive inbound SMS. To take advantage of the add-ons below get an additional VoIP phone number.
  • Inbound SMS only
  • No Voicemail
  • No Call Forwarding
  • No Automations

Services

Refer to the following table for a breakdown of some of the popular supported services.
Service
Non VoIP (real)
VoIP (virtual)
ALL
Alibaba
Amazon
Apple
✓*
Bill.com
Brex
Convoy
Chase
Clubhose
Craigslist
Discord
Facebook
GoDaddy
Google
✓*
Gusto
Hubspot
Instagram
Intuit
John Hancock
LinkedIn
Mailchimp
Microsoft
Paypal
SendGrid
Shopify
Snapchat
Stripe
SVB
Telegram
TikTok
Tinder
Twilio
✓*
Twitter
Uber
Whatsapp
✓*: The following services will work with our virtual phone number via voice call transcription.
Last modified 4mo ago