Minisip for Windows XP questions

[fulan Peng]

Hi,

1, I installed a Yxa sip server on 192.168.0.1 which is a router to
outside network. I have a qualified domain name ddint.org to resolve
an external IP to this computer.  Now I am installing minisip on
192.168.0.90.  How do I installed a sip proxy?

2, The sip server at 192.168.0.1 has a TSL listening on port 5061. How
can I make a certificate on Windows XP in order to use TSL?

3, When I click minisip.exe, it show the serial number of the network
interface. I input that number into the minisip.conf file. I closed
it. Then I open minisip.exe again. It still cannot find the network
interface. Why?