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Please Help VoIP+NAT = Misery

Posted by xenoscion on Fri, 12/12/2008

So after a few failures I have kinda hit the wall with this one. The first failure was solely blamed on NAT as we where using a MIP to route a public ip address to the private ip of our PBX. I nixed that after the huge problems it caused.So I ordered a /30 and out that on a interface on our router and put in in the DMZ. The problem got better but not completely, the phones will still not stay registered. As far as PBX settings, I have tried them all NAT, no NAT. CANREINVITE off and on. Some of the phones work some don't, same story. So to wrap this up am at a point now of A) Buying a switch and putting that in between the feed at our colo coming in where there would be the feed plugged in to port 1 , the firewall would go in port 2 and the PBX in port 3 on its own subnet. B) Buying or making a proxy server which I have very little experience with or C) having the colo provision a new Ethernet drop with it's own subnet. So I need a little advice on A) which of those would work and B) which would be the "best practice"?
Thanks in advance,
Brandon


Submitted by eeman on Sun, 12/14/2008 Permalink

in detail, describe the connectivity at both ends and what settings you're running in terms of nat etc.

Submitted by xenoscion on Tue, 12/16/2008 Permalink

It turns out it was the UDP timeout in one of our Juniper SSG5's. I can't believe it was something so easy. After I increased the timeout, the PBX is working like a champ. I appreciate your reply as Alex told me you where the man to talk to. If i wanted to pay for your consulting where would I go to purchase it?

Thanks,

Brandon

Submitted by eeman on Tue, 12/16/2008 Permalink

our main office # is 502-589-4638. Steve Sadd is the person to talk to about getting you setup as a consulting account in our CRM.