problem with 481 response to PRACK

 

I have been finding that the nist stack sometimes returns a 481 response
in response to PRACK under load conditions. The call flow was --> INVITE
<-- TRYING <--- 183 --> PRACK <-- 481. Normally, the application would
return an OK for the PRACK but randomly a 481 is generated from the
stack.

 

The debug log appears to indicate that that dialog does not exist:

 

DEBUG -
gov.nist.javax.sip.DialogFilter.processRequest(DialogFilter.java:192)
[dialog = null]

DEBUG -
gov.nist.javax.sip.DialogFilter.processRequest(DialogFilter.java:329)
[Processing PRACK for dialog null]

DEBUG -
gov.nist.javax.sip.DialogFilter.processRequest(DialogFilter.java:334)
[Dialog does not exist PRACK
sip:[email protected]:6060 SIP/2.0

 isServerTransaction = true]

DEBUG -
gov.nist.javax.sip.DialogFilter.processRequest(DialogFilter.java:341)
[Sending 481 for PRACK - automatic dialog support is enabled -- cant
find dialog!]

DEBUG -
gov.nist.javax.sip.stack.UDPMessageChannel.<init>(UDPMessageChannel.java
:198) [Creating message channel 10.100.38.198/5060] 

 

Does anyone have any idea how to resolve the problem? I have more debug
information captured if anyone needs.

 

 

Thanks,

 

Jim Barton

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