Test a Phone Number's Interoperability, Caller Id, Reputation, and STIR/SHAKEN Attestation Level

Test PSTN and VOIP Calls

We create tools to make it easy test and troubleshoot phone calls.

Current Features


Simply call one of the Telephone Numbers or SIP addresses listed below. Listen on the line for information about your call and calling number.

Test PSTN Numbers

Note: different numbers may return different results

Test SIP Addresses

How It Works

The Phone Numbers and SIP addresses at testnumber.org map to Twilio functions which use Scout to detect Robocalls.

SHAKEN/STIR Response Reference

Currently the SHAKEN/STIR response is derived from Twilio’s implementation which is documented here