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PM34843: SUCCESSIVE RE-INVITES ON THE SAME CALL LEG ARE NOT BLOCKED BY THE SIP CONTAINER.

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APAR status

  • Closed as program error.

Error description

  • If sending successive re-INVITES on the same call leg before the
    first has completed, the SIP container does not block the
    successive re-INVITES with an error.
    
    According to the RFC, the successive re-INVITES should receive
    a 500 error with a retry-after header.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  IBM Websphere Application Server version    *
    *                  7.0 CEA Session Initiation Protocol (SIP)   *
    *                  users                                       *
    ****************************************************************
    * PROBLEM DESCRIPTION: The SIP Container does not send a 500   *
    *                      response on a second INVITE, when no    *
    *                      final response to a first INVITE on     *
    *                      the same dialog.                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The SIP Container receives a second INVITE before it sends the
    final response to a first INVITE on the same dialog and
    does not return a 500 (Server Internal Error) response to the
    second INVITE (as mentioned in section 14.2 in RFC 3261).
    In TransactionUserImpl, when processing a UAS request, we
    do not check if there is a final response to a previous INVITE
    on the same dialog.
    

Problem conclusion

  • In TransactionUserImpl, when processing a UAS request, we now
    mark each INVITE as non-final till we get final response. In
    addition, we check if there is a previous INVITE with non-final
    response, and if so - we send a 500 error with Retry-After
    header with a randomly chosen value of between 0 and 10 seconds.
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 1.0.0.11. 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 number

    PM34843

  • Reported component name

    CEA FEATUREPACK

  • Reported component ID

    5724J0855

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-03-15

  • Closed date

    2011-05-04

  • Last modified date

    2011-05-04

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

    PM34414

  • 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



Document information

More support for: WebSphere Application Server V7 Feature Pack for Communications Enabled Applications
General

Software version: 700

Reference #: PM34843

Modified date: 04 May 2011