PM66054: SIP REQUEST THAT EXCEEDS THE MTU VALUE MIGHT NOT SWITCH FROM UDP TO TCP.

8.0.0.4: WebSphere Application Server V8.0 Fix Pack 4
8.5.0.1: WebSphere Application Server V8.5 Fix Pack 1
8.0.0.5: WebSphere Application Server V8.0 Fix Pack 5
8.5.0.2: WebSphere Application Server V8.5 Fix Pack 2
8.0.0.6: WebSphere Application Server V8.0 Fix Pack 6
8.0.0.7: WebSphere Application Server V8.0 Fix Pack 7
8.0.0.8: WebSphere Application Server V8.0 Fix Pack 8
8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15

APAR status

• Closed as program error.

Error description

• SIP request that exceeds the MTU value might not
  switch from UDP to TCP.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server V8.0 and V8.5 Session Initiation     *
  *                  Protocol (SIP) Container                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Sending a large SIP request that        *
  *                      exceeds the MTU value does not cause    *
  *                      a transport switch from UDP to TCP.     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  An exception is being thrown when a package exceeds the MTU
  value and a certain custom property
  ("javax.sip.strict.outbound.local.port") is false which is its
  default value. This flag does not allow to send a package over
  a listening point that is different from the one mentioned in
  the SIP message. In our case the "if" statement that checks
  the custom property value was supposed to throw the exception
  on "javax.sip.strict.outbound.local.port" having a true value
  and not false.
  

Problem conclusion

• The erroneous "if" statement was changed.
  
  The fix for this APAR is currently targeted for inclusion in
  fix packs 8.0.0.4 and 8.5.0.1.  Please refer to the Recommended
  Updates page for delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  PM67724

Fix information

• Fixed component name

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R800 PSY

     UP

• R850 PSY

     UP