Jul 27 15:56:50 VERBOSE[20836] logger.c:     -- Executing Goto("Zap/2-1", "ivr-4|s|begin") in new stack
Jul 27 15:56:50 VERBOSE[20836] logger.c:     -- Goto (ivr-4,s,5)
Jul 27 15:56:50 VERBOSE[20836] logger.c:     -- Executing Set("Zap/2-1", "TIMEOUT(digit)=3") in new stack
Jul 27 15:56:50 VERBOSE[20836] logger.c:     -- Digit timeout set to 3
Jul 27 15:56:50 VERBOSE[20836] logger.c:     -- Executing Set("Zap/2-1", "TIMEOUT(response)=10") in new stack
Jul 27 15:56:50 VERBOSE[20836] logger.c:     -- Response timeout set to 10
Jul 27 15:56:50 VERBOSE[20836] logger.c:     -- Executing BackGround("Zap/2-1", "custom/h") in new stack
Jul 27 15:56:50 DEBUG[20836] channel.c: Scheduling timer at 160 sample intervals
Jul 27 15:56:50 VERBOSE[20836] logger.c:     -- Playing 'custom/h' (language 'en')
Jul 27 15:56:51 DEBUG[20836] channel.c: Scheduling timer at 138 sample intervals
Jul 27 15:56:52 DEBUG[20836] channel.c: Scheduling timer at 0 sample intervals
Jul 27 15:56:52 DEBUG[20836] channel.c: Scheduling timer at 0 sample intervals
Jul 27 15:56:53 DEBUG[20836] chan_zap.c: DTMF digit: f on Zap/2-1
Jul 27 15:56:53 DEBUG[20836] chan_zap.c: Fax already handled
Jul 27 15:56:57 DEBUG[20836] chan_zap.c: DTMF digit: f on Zap/2-1   

And so on and so on 

The console output is: 

-- Starting simple switch on 'Zap/2-1'
    -- Executing NoOp("Zap/2-1", "Entering from-zaptel with DID == ") in new stack
    -- Executing Set("Zap/2-1", "DID=s") in new stack
    -- Executing NoOp("Zap/2-1", "DID is now s") in new stack
    -- Executing GotoIf("Zap/2-1", "1?zapok:notzap") in new stack
    -- Goto (from-zaptel,s,7)
    -- Executing NoOp("Zap/2-1", "Is a Zaptel Channel") in new stack
    -- Executing Set("Zap/2-1", "CHAN=2-1") in new stack
    -- Executing Set("Zap/2-1", "CHAN=2") in new stack
    -- Executing Macro("Zap/2-1", "from-zaptel-2|s|1") in new stack
    -- Executing NoOp("Zap/2-1", "Returned from Macro from-zaptel-2") in new stack
    -- Executing Goto("Zap/2-1", "ext-did|s|1") in new stack
    -- Goto (ext-did,s,1)
    -- Executing Set("Zap/2-1", "FROM_DID=s") in new stack
    -- Executing Goto("Zap/2-1", "ivr-4|s|1") in new stack
    -- Goto (ivr-4,s,1)
    -- Executing Set("Zap/2-1", "LOOPCOUNT=0") in new stack
    -- Executing Set("Zap/2-1", "__DIR-CONTEXT=default") in new stack
    -- Executing Answer("Zap/2-1", "") in new stack
    -- Executing Wait("Zap/2-1", "1") in new stack
    -- Executing Set("Zap/2-1", "TIMEOUT(digit)=3") in new stack
    -- Digit timeout set to 3
    -- Executing Set("Zap/2-1", "TIMEOUT(response)=10") in new stack
    -- Response timeout set to 10
    -- Executing BackGround("Zap/2-1", "custom/h") in new stack
    -- Playing 'custom/h' (language 'en')
    -- Redirecting Zap/2-1 to fax extension
    -- Timeout on Zap/2-1