asterisk users - Jun 2011 - PRI hangup request, cause 18

We have 2 PRI from AT&T 

And all is well but only few numbers having following issue. We are getting
hangup cause 18 do you guys have any idea ? We have just migrate 1.2 to 1.8 and
this issue raised

[Jun  7 17:57:10] VERBOSE[23717] sig_pri.c:     -- Span 2: Channel 0/3 got
hangup request, cause 18
[Jun  7 17:57:10] DEBUG[24856] sig_pri.c: Not yet hungup...  Calling hangup once
with icause, and clearing call
[Jun  7 17:57:33] VERBOSE[23717] sig_pri.c:     -- Span 2: Channel 0/4 got
hangup request, cause 18

 		 	   		  
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satish patel wrote:
> We are getting hangup cause 18
http://networking.ringofsaturn.com/Routers/isdncausecodes.php

*Cause No. 18 - no user responding.*
This cause is used when a called party does not respond to a call 
establishment message with either an alerting or connect indication 
within the prescribed period of time allocated.

What it means:
The equipment on the other end does not answer the call. Usually this is 
a misconfiguration on the equipment being called.



Doug

-- 
Ben Franklin quote:

"Those who would give up Essential Liberty to purchase a little Temporary
Safety, deserve neither Liberty nor Safety."