verbosity is at least 22
    -- Accepting call from '6517616' to '6700927' on channel 0/2, span 1
    -- Executing Set("Zap/2-1", "FROM_DID=6700927") in new stack
    -- Executing Set("Zap/2-1", "FAX_RX=system") in new stack
    -- Executing Set("Zap/2-1", "FAX_RX_EMAIL=test@example.com") in new stack
    -- Executing Answer("Zap/2-1", "") in new stack
    -- Executing Wait("Zap/2-1", "20") in new stack
    -- Redirecting Zap/2-1 to fax extension
  == Spawn extension (from-pstn, fax, 0) exited non-zero on 'Zap/2-1'
    -- Executing Goto("Zap/2-1", "ext-fax|in_fax|1") in new stack
    -- Goto (ext-fax,in_fax,1)
    -- Executing StopPlayTones("Zap/2-1", "") in new stack
    -- Executing GotoIf("Zap/2-1", "1?3:analog_fax|1") in new stack
    -- Goto (ext-fax,in_fax,3)
    -- Executing Macro("Zap/2-1", "faxreceive") in new stack
    -- Executing Set("Zap/2-1", "FAXFILE=/var/spool/asterisk/fax/1163696220.25731.tif") in new stack
    -- Executing Set("Zap/2-1", "EMAILADDR= test@example.com") in new stack
    -- Executing RxFAX("Zap/2-1", "/var/spool/asterisk/fax/1163696220.25731.tif") in new stack
    -- Executing System("Zap/2-1", "/var/lib/asterisk/bin/fax- process.pl --to test@example.com --from freepbx@gmail.com --subject "Fax from 6517616 " --attachment 6517616.pdf --type application/pdf --file /var/spool/asterisk/fax/1163696220.25731.tif") in new stack
    -- Executing Hangup("Zap/2-1", "") in new stack
  == Spawn extension (ext-fax, in_fax, 5) exited non-zero on 'Zap/2-1'
    -- Executing Hangup("Zap/2-1", "") in new stack
  == Spawn extension (ext-fax, h, 1) exited non-zero on 'Zap/2-1'
    -- Hungup 'Zap/2-1'