Two Polycom V2IU 4300T firewall traversal units were installed in two of my districts during the last two days. These two districts are part of my RUS grant and we were not able to make H323 work through their firewalls. So this is my first experience with firewall traversal, not counting the demo unit we tried out this summer.
All the tests we did this summer for the WAN side configuration still worked great. Connecting to my Tandberg Gatekeeper & Gateway worked fine still too. I’m glad because the gatekeeper is on a new version since the summer tests. Yeah for H323 standards!
I learned two things about setting up the Polycoms behind the V2IU.
- NAT has to be disabled on the Polycom VSX 7000. The endpoint just knows its internal IP and the V2IU as its gatekeeper.
- The endpoint gets registered with the V2IU as its gatekeeper and then the V2IU registers with the WAN side gatekeeper – my Tandberg Gatekeeper. And voila everything works.
This is our first year also having districts with multiple units. So our next puzzle has been – how do we have the endpoints within the same district network call each other? I have one district where it works and another where it doesn’t. The rest we haven’t tried yet. So I asked the Polycom field engineer how these units behind the V2IU will call each other – and the answer is – they call each other using their e.164 or H323 alias. So I learned yet another thing today! It’s likely that’s the solution in the district where it doesn’t work. More testing to do and one more puzzle solved.