This is a brief list of possible errors. Keep in mind that other factors could cause these errors, but here is what to look for first.
- 400: Not using a phone number verified by Twilio. This could be an issue with the
from_number
parameter or thetwilio_number
parameter, but not theto_number
parameter. - 401: Invalid account SID or auth token
- undefined error: Blank account SID
Call hangs up after caller answers Twilio call: The Twilio account is a trial account, and the to_number
parameter is for a phone number that is not verified.
It may also be that the verified phone number does not match exactly. For example, 19876543210
was called instead of +19876543210
(that +
makes a difference).