asterisk users - Sep 2007 - ZAP to invalid SIP device call looping

Hello,

  When I receive calls in one FXO port (TDM400 or A200, occurs in both) and 
it dial to one invalid SIP extension, the call never hangup.

  The call would have to be dropped, but it seems that "Starting simple 
switch on 'Zap/1-1'" and "Hungup 'Zap/1-1'"
occurs almost at the same time.

  If the dial is made to a valid SIP extension, the call is proceeded and 
terminated without any problem.

  Anybody had the same situation?

  Thanks in advance!


Regards,
Gustavo


- Asterisk 1.4.11


- Zaptel 1.4.5.1


- Call log:

  -- Starting simple switch on 'Zap/1-1'
  -- Executing [s at fxo-01:1] Dial("Zap/1-1",
"SIP/at001-a|30|r") in new stack
== Everyone is busy/congested at this time (1:0/0/1)
  -- Executing [s at fxo-01:2] Hangup("Zap/1-1", "") in new
stack
== Spawn extension (fxo-01, s, 2) exited non-zero on 'Zap/1-1'
  -- Hungup 'Zap/1-1'
  -- Starting simple switch on 'Zap/1-1'
  -- Executing [s at fxo-01:1] Dial("Zap/1-1",
"SIP/at001-a|30|r") in new stack
== Everyone is busy/congested at this time (1:0/0/1)
  -- Executing [s at fxo-01:2] Hangup("Zap/1-1", "") in new
stack
== Spawn extension (fxo-01, s, 2) exited non-zero on 'Zap/1-1'
  -- Hungup 'Zap/1-1'
  -- Starting simple switch on 'Zap/1-1'
  -- Executing [s at fxo-01:1] Dial("Zap/1-1",
"SIP/at001-a|30|r") in new stack
== Everyone is busy/congested at this time (1:0/0/1)
  -- Executing [s at fxo-01:2] Hangup("Zap/1-1", "") in new
stack
== Spawn extension (fxo-01, s, 2) exited non-zero on 'Zap/1-1'
  -- Hungup 'Zap/1-1'
  -- Starting simple switch on 'Zap/1-1'
  -- Executing [s at fxo-01:1] Dial("Zap/1-1",
"SIP/at001-a|30|r") in new stack
== Everyone is busy/congested at this time (1:0/0/1)
  -- Executing [s at fxo-01:2] Hangup("Zap/1-1", "") in new
stack
== Spawn extension (fxo-01, s, 2) exited non-zero on 'Zap/1-1'
  -- Hungup 'Zap/1-1'
  ...


- extensions.conf:

[fxo-01]
exten = s,1,dial(SIP/at001-a,30,r)
exten = s,n,hangup()


- zapata.conf:

[channels]
usecallerid = no
callwaiting = no
echocancel = yes
echotraining = yes
echocancelwhenbridged = yes
immediate = no
busydetect = yes
busycount = 3
callprogress = yes
progzone = br
faxdetect = no

context = fxo-01
signalling = fxs_ks
channel = 1

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