Unless your system has built-in Ethernet, to use SIP signaling, you will need an Ethernet adapter installed and configured for use with AIX. See your AIX manuals for instructions. You can then connect to your IP network to use it for SIP signaling using the Ethernet port on the installed card or at the back of the pSeries computer. See Blueworx Voice Response for AIX: Installation for more information on connecting Blueworx Voice Response to the network.
Note that you can choose to use separate Ethernet adapters for SIP and voice (RTP) communication, or a separate Ethernet adapter for both SIP and voice (RTP) communication.