By default, when a SIP user agent located behind a NAT device or firewall initiates a connection, the SIP container keeps the connections alive. SIP user agents located behind a NAT are able to communicate with SIP nodes located on the other side of NAT.

The associated configuration parameter, SIP Outbound Support, is accessible in the Administration Console. The check box entry for SIP Outbound Support is selected, by default. You can disable the default support for connections that SIP user agents located behind a NAT initiate with SIP nodes located on the other side of NAT. To do so, the General configuration tab for SIP Server in the Domain Structure for the Administration Console and clear and the SIP Outbound Support check box.

If the check box for the SIP Outbound Support entry is cleared, all communication handling between user agents located behind a NAT and SIP nodes located on the other side of NAT is disabled. See "About Accessing the Administration Console" in Converged Application Server Administrator's Guide.