Troubleshooting
Problem
The transport of an outbound session initiation protocol (SIP) request that exceeds the maximum transmission unit (MTU) does not switch from user datagram protocol (UDP) to transmission control protocol (TCP).
Symptom
After sending out a SIP request that slightly exceeds the MTU threshold, over UDP, the response fails to arrive. The request is retransmitted several times until the transaction times out.
[{"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":"Servlet Engine\/Web Container","Platform":[{"code":"PF016","label":"Linux"}],"Version":"7.0","Edition":"Network Deployment","Line of Business":{"code":"LOB77","label":"Automation Platform"}},{"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":"Servlet Engine\/Web Container","Platform":[{"code":"PF035","label":"z\/OS"}],"Version":"7.0","Edition":"","Line of Business":{"code":"LOB77","label":"Automation Platform"}}]
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Document Information
Modified date:
03 March 2025
UID
swg21316620