The following issue has been RESOLVED. 
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https://bugtracker.iptel.org/view.php?id=71 
====================================================================== 
Reported By:                vbroz
Assigned To:                kubartv
====================================================================== 
Project:                    SEMS
Issue ID:                   71
Category:                   SIP stack
Reproducibility:            always
Severity:                   feature
Priority:                   normal
Status:                     resolved
Resolution:                 fixed
Fixed in Version:           
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Date Submitted:             2012-02-06 00:54 CET
Last Modified:              2012-02-24 11:39 CET
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Summary:                    400 Bad Request for unresolvable destination (DNS)
-> 404 or even 478 (as in SR)
Description: 
wondering if it is the best way to repsonse with "400 Bad Request" when the
routing is based on RURI and SEMS tries to resolve the hostpart of URI
(e.g. unresolvabledomain.com), but if DNS query is not successful, SEMS
replies with 400... 

Does it makes sense for SBC to send e.g. 404 Not Found or even like in SER
478 Unresolvable destination?

Thanks,
-Vlada 
====================================================================== 

---------------------------------------------------------------------- 
 (0000112) kubartv (developer) - 2012-02-24 11:37
 https://bugtracker.iptel.org/view.php?id=71#c112 
---------------------------------------------------------------------- 
quick fix in master, 59f0e20cc3756ea9db5b644a854d194769f3462c

It is just temporary solution and should be replaced by more appropriate
error propagation mechanism. 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2012-02-06 00:54 vbroz          New Issue                                    
2012-02-06 00:54 vbroz          File Added: 400_dns_not_resolved.log            
       
2012-02-23 13:47 kubartv        Status                   new => assigned     
2012-02-23 13:47 kubartv        Assigned To               => kubartv         
2012-02-24 11:37 kubartv        Note Added: 0000112                          
2012-02-24 11:39 kubartv        Status                   assigned => resolved
2012-02-24 11:39 kubartv        Resolution               open => fixed       
2012-02-24 11:39 kubartv        version                   => master          
======================================================================
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