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May it be that SIPP send the message to itself?
Please enable SIP message debug on the SIP server side via the SIP extension of the WLS Admin Console. You will than see in the AdminServer.log how the message flow goes and what messages is sent from and to which IP+port and whether TCP or UDP is used.
Kai has suggested correct way to further troubleshoot it.
You may also specify specific listen address for your sipserver in config.xml or through console rather than specifying no value which defaults to any IP.
Also in sipp you can use -i option to specify source ip and ip option to specify port for for sip request sent to server .By default port used is sipp is 5060