APAR status
Closed as program error.
Error description
Several methods in Session Initiation Protocol (SIP) can establish a dialog. When they do so, they also establish an association between the endpoints within that dialog. This association has been known for some time as a "dialog usage" in the developer community. A dialog initiated with an INVITE request has an invite usage. A dialog initiated with a SUBSCRIBE request has a subscribe usage. A dialog initiated with a REFER request has a subscribe usage. Dialogs with multiple usages arise when a usage-creating action occurs inside an existing dialog. Such actions include accepting a REFER or SUBSCRIBE issued inside a dialog established with an INVITE request. The problem is that the current implementation of this feature is not working correctly and dialog usages are not added/removed correctly. For example, a subscribe usage within an existing dialog is not added to the usages table, and a terminating response doesn't remove its dialog usage.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: IBM Websphere Application Server version * * 7.0 Feature Pack for Communications * * Enabled Applications (CEA) Session * * Initiation Protocol (SIP) users * **************************************************************** * PROBLEM DESCRIPTION: Dialog usages are not added or removed * * correctly as specified by Request For * * Comments (RFC) 5057. * **************************************************************** * RECOMMENDATION: * **************************************************************** The session state was not updated when receiving another initial request on the same dialog, and when a terminating response is received. This caused the dialog usages table to not get updated as well. The tests were also not good, since they did not check the result header of the request.
Problem conclusion
The code was updated in the flow of sending a response (onSendingResponse()) to update the session state (and thus the dialog usages table). In addition, a mechanism was added to remove dialog usages when a terminating response is received. Tests were fixed as well. The fix for this APAR is currently targeted for inclusion in Feature Pack for CEA 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
PM29534
Reported component name
WEBS APP SERV N
Reported component ID
5724H8800
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-12-27
Closed date
2011-01-28
Last modified date
2011-08-04
APAR is sysrouted FROM one or more of the following:
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