OTPs delivered via SMS appear to originate from multiple different phone numbers

Version Affected:  All

Description:  

When end users are receiving OTPs via SMS the sender number is not consistent and appears to be coming from different phone numbers rather than a fixed SMS shortcode or an alphanumeric SMS sender label. 

Cause:  

Normally we appear to send SMS from an alphanumeric label "SecureAuth" but that is blocked in the US.  Additionally SMS short codes are heavily blocked on Sprint and T-Mobile.

Resolution:  

To circumvent SMS blocking in such circumstances, our SMS provider delivers such messages via a pool of "long number" senders to ensure the SMS isn't blocked.

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