asterisk users - May 2005 - how do you get rid of Spawn's

Hi everybody, How do I get rid of spawn's ?

example

  -- Executing Dial("Zap/23-1",
"sip/xxx2769906@xxx.xxx.xxx.xxx") in new
stack
    -- Called xxx2769906@xxx.xxx.xxx.xxx
    -- Accepting call from 'xxx3672728' to 'xxx2769906' on
channel 0/23,
span 1
    -- SIP/xxx.xxx.xxx.xxx-0adc is ringing
    -- SIP/xxx.xxx.xxx.xxx-0adc answered Zap/23-1
    -- Channel 0/23, span 1 got hangup
  == Spawn extension (from-pstn, xxx2769906, 1) exited non-zero on 
'Zap/23-1'
    -- Executing Dial("Zap/23-1", "sip/h@xxx.xxx.xxx.xxx")
in new stack
    -- Called h@xxx.xxx.xxx.xxx
  == Spawn extension (from-pstn, h, 1) exited non-zero on 'Zap/23-1'
    -- Hungup 'Zap/23-1'
    -- Got SIP response 404 "No user h@xxxxx.shelcomm.com at this 
server" back from xxx.xxx.xxx.xxx