On Linux:
execute the command
netstat -atunp | grep java
The result should show something like this:
tcp6 0 0 ::ffff:192.168.0.2:5060 :::* LISTEN 7409/java udp6 0 0 ::ffff:192.168.0.2:5060 :::* 7409/java
The computer listen on public address for SIP on UDP and TCP.
On windows:
netstat -an
The result should show containing something like this:
TCP 192.168.0.2:5060 0.0.0.0:0 LISTENING TCP 127.0.0.1:7123 0.0.0.0:0 LISTENING UDP 192.168.0.2:5060 *:*