Connected to Asterisk 1.4.2 currently running on localhost (pid = 3880)
Verbosity is at least 3
localhost*CLI> zap show channels
   Chan Extension  Context         Language   MOH Interpret
 pseudo            mycontext                  default
      1            mycontext                  default
      2            mycontext                  default
-----------------------------------------------------------------------------------------------
My extensions.conf 40 number:

exten => 40,1,Answer()
exten => 40,2,NoOp(${LANGUAGE})
exten => 40,3,Playback(demo-moreinfo)
exten => 40,4,Set(CHANNEL(language)=it)
exten => 40,5,NoOp(${LANGUAGE})
exten => 40,6,Playback(demo-moreinfo)


exten => 40,7,Hangup()

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localhost*CLI>

    -- Starting simple switch on 'Zap/2-1'
    -- Executing [40@mycontext:1] Answer("Zap/2-1", "") in new stack
    -- Executing [40@mycontext:2] NoOp("Zap/2-1", "") in new stack
    -- Executing [40@mycontext:3] Playback("Zap/2-1", "demo-moreinfo") in new stack
    -- <Zap/2-1> Playing 'demo-moreinfo' (language 'en')
    -- Executing [40@mycontext:4] Set("Zap/2-1", "CHANNEL(language)=it") in new stack
    -- Executing [40@mycontext:5] NoOp("Zap/2-1", "") in new stack
    -- Executing [40@mycontext:6] Playback("Zap/2-1", "demo-moreinfo") in new stack
    -- <Zap/2-1> Playing 'demo-moreinfo' (language 'it')
    -- Executing [40@mycontext:7] Hangup("Zap/2-1", "") in new stack
  == Spawn extension (mycontext, 40, 7) exited non-zero on 'Zap/2-1'
    -- Hungup 'Zap/2-1'