If you have a Asterisk system being used for sending and receiving faxes and all of the sudden the faxes all start failing with various error messages the first thing that should be checked is the status of either the analog telephone lines, the T1’s, or the SIP provider you are using as a outbound proxy. Below I describe some of the error messages that may be received via Hylafax in this example as well as how to check the status of the T1’s themselves to make sure that there are no alarms present before you have to get into troubleshooting Hylafax in detail.
Earlier while troubleshooting an issue for a client of mine I ran into an issue when testing HylaFAX’s sendfax via the CLI. The error complained of some font files that appear to have been previously upgraded by someone else on the server which is running a fairly old version of Ubuntu Linux. Anyhow the error along with the quick resolution to the issue are noted below.