I keep getting
One Message Not Sent
A 'From' phone number is required. For more information, see https://www.twilio.com/docs/errors/21603
... despite having followed all the setup instructions at https://wiki.civicrm.org/confluence/display/CRMDOC/Setting+up+a+SMS+Provider+for+CiviSMS#SettingupaSMSProviderforCiviSMS-twilio to the letter. Is something in the extension out of date? Something I need to change in the code to make it work with the current Civi iteration?
WP 4.7.2 / Civi 4.7.15