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As long as you have a clear path for port 5003 from the outside to the server, then you should be able to view traffic.
Things to check:
1) Router NAT should point incoming port 5003 to the INTERNAL IP address of your server (IE 192.168.0.25)
2) Router firewall should have exceptions for port 5003 incoming AND outgoing (if applicable).
3) Server firewall should have exceptions for port 5003 (probably already does).
4) http://www.canyouseeme.org/ go here on your server, type in 5003 and see if it's accessible from the outside.
5) If 4 is NO, Call your ISP and see if anything they need to do to open 5003 hasn't been done.
Since you are using a T1 provider, I am suspicious that the ISP blocking 5003 somewhere in the chain.
Thank you for the www.canyouseeme.org link. Immediately after I used the utility, the port allowed me in with no problem.