sundance-communications.com/forum Forums VOIP Phones & IP PBX VoIP & Cloud Phones, Hosted PBX, General IP Phones VOIP over Internet and NAT

I haven't done any VOIP yet. I work on Toshiba at my Company (which sells Mitel for customers wanting VOIP). Have one customer (IT guy)wants VOIP for an existing Toshiba CTX, but per Toshiba, the switch must have a Public IP, with No NAT at all on the switch side, unless you use VPN. (Toshiba tech says that they are working on a solution for NAT).

Customer doesn't like that answer, and returned several IP phones to us. Doesn't want to use VPN. Just wants the phones to work at peoples houses over a DSL line.

How are other switches commonly configured for VOIP over the Internet?

I've made a CTX work by putting on a DMZ behind a NAT router. You could accomplish the same thing by opening all the ports that the CTX uses but I don't know what the UDP ports are.

Tadiran switches work well for this. They have a device called a sentinel that overcoms the NAT transvsersal issues and having multiple people at a single IP remote location. No matter what you have to have at least 1 public ip no matter what system, per location simply because of the internet and the way it works. Internally is totally different.

It's not that complicated. All you need is to give the BIPU card a public IP address. The IP phones will work behind the user's router as long as you can ping the BIPU card.

I told him that he would need a public IP. He wants it to work with a private IP without VPN. I should him that it will not work the way he wants.

I read which ports, TCP and UDP, are needed. The customer said he fowarded all ports to the BIPU with no luck.

The company I work for (now) believes that a Mitel will do what he wants, and proposed using Mitel over the Internet and connecting to the CTX with QSig.

The other thing I don't understand is if a BIPU card has a public IP, then can it ONLY be used externally?

I hear that over switches also require a public IP. I know there is a QOS issue over the Internet.

Next week I'll be starting work at a company that does Toshiba and Shoretel. Maybe they have done more IP phones over the Internet then this one has.

Maybe I heard that other switches need a Public IP from Coral Tech... But I also heard one other person tell me the same thing.

This customer does Data, and thinks in terms of Data servers. If he can get his servers on the internet behind NAT, then he thinks the phone system should work also.

We just pulled his only BIPU-M (IP phones)card and returned it to Toshiba the other day. It wasn't working correctly anyway.

Data guys are afraid of security with public IP's. I have done several Toshiba VOIP applications, all with public IP's. There are no security issues, and the phones work perfectly on a DSL at the users home or office.

Not all data guys! lol.

Frankly, there's not much someone can do to a phone or system sitting on public address space, especially if you have a copy of the final config handy to re program it IF it does get cracked. The data should be on a different network regardless IMHO.

This ends up being less of a problem than a scriptkiddie running a printer sitting on a jetdirect in public space out of paper.

In the end not much fun for the kiddie.

cef1000

CEF1000:

Is that a new variation of the English language you just used in your post? I can't understand half of what my 15 year-old says most of the time, but I figure it out by working it backwards. I am totally baffled by what you just posted. What's a "scriptkiddie" and a "jetdirect"?

Please don't spread this around, but what does "LOL" and "IMHO" mean? I am young enough to know the answer but old enough to have an excuse for not knowing. I probably speak for others in this forum.

Ed- LOL(laughing out loud)& IMHO (In my humble opinion)