[Asterisk-Users] Spawn extension -----what does this mean ?

[Asterisk guy]

for every call, * gives out :
 Spawn extension (default, 00xxxxxxxxx, 3) exited non-zero on 
'SIP/201.50.117.161-081628e0' 
    Spawn extension -----what does this mean ? how to avoid this ?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20050513/fd156a67/attachment.htm