Q: What does "No receiver protocol (T.30 T1 timeout); too many attempts to dial" error mean when a fax fails to get sent?
A: The error means that the fax system did not detect any fax tones ("receiver protocol") when calling the number. For troubleshooting purposes, call the number in question from a voice line (e.g. a cell phone) to confirm that you are getting fax tones. If you don't get a fax tone that means that the number is not a fax line and it cannot receive faxes.