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PM33919: SIP DOES NOT PARSE THE VIA BRANCH CORRECTLY.

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Session Initiation Protocol (SIP) does not parse the Via branch
correctly.

The SIP container is removing all characters in SIP Via header's
branch field that are present after an ' (apostrophe). This
causes the SIP container to believe the subsequent new INVITE
that comes in with unique Call-IDs are retransmissions for
previous INVITEs (because when SIP container strips off the
characters after the apostrophe the branch ID values match) .
SIP container just retransmits its original response and it
breaks the call.

WebSphere Application Server V7.0.
Distributed operating systems.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED:  SIP (Session Initiation Protocol) IBM       *
*                  WebSphere Application Server Feature Pack   *
*                  for Communications Enabled Applications     *
*                  (CEA) users                                 *
****************************************************************
* PROBLEM DESCRIPTION: The parser does not consume the         *
*                      apostrophe (') character when           *
*                      processing header parameters.           *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The problem is in the SIP parser, when processing a header
parameter value. The parser does not recognize the apostrophe
(ASCII code 39) or the grave accent (ASCII code 96) as valid
characters in the token. This results in a broken parameter.

    



Problem conclusion


    

  • The bug is fixed in the SIP parser. With this fix, header
parameters are parsed correctly, including the apostrophe and
grave accent characters.

The fix for this APAR is currently targeted for inclusion in
fix pack 1.0.0.11 for the Feature Pack for Communications
Enabled Applications. Please refer to the Recommended Updates
page for delivery information:
http://www-01.ibm.com/support/docview.wss?rs=180&uid=swg27017328

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    PM33919
    • 

  • Reported component name
    CEA FEATUREPACK
    • 

  • Reported component ID
    5724J0855
    • 

  • Reported release
    700
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2011-03-02
    • 

  • Closed date
    2011-03-14
    • 

  • Last modified date
    2011-03-14
    • 





    

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

    
PM32132
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    CEA FEATUREPACK
    • 

  • Fixed component ID
    5724J0855
    • 



Applicable component levels


    

  • R700  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            09 February 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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