sundance-communications.com/forum Forums TDM Business Telephone Systems Toshiba Telephones & Systems CTX 28 to CTX 28

Hi,

I am wondering if there is anywhere to connect two remote CTX 28's via the internet? I can either go through a VPN tunnel or put it outside of the VPN. I would expect to have to change the dial plan on one phone system. For example location A Ext 200-215 and Location B Ext 300-315? Is this possible? If not is possible to goto a larger CIX or CTX on one end?

Thanks

Greg

Not possible with the CTX-28. They do not do VoIP. You would need 2 CIX-40 (the system that replaced the CTX-28) with GIPU or MIPU at each end and licenses for Stratanet.

You need to involve your dealer. Placentia is not too far away from us if you need one that does VoIP all the time.

put VoIP ATA adapters onto a PSTN line port on both systems and program systems to pickup the VoIP line and the calls will be free between sites. Program DISA on the VoIP lines and it will give you desk to desk dialling.
Not quite a complete solution but will give you free calls between sites.

I agree with newtecky put CIX40's into each site and it will be more integrated and work much better.

Thats true. As long as you have 1 or more analog trunk available at each site, you could dial an access code to get the dialtone off the other switch then dial the extensions. You may even be able to transfer calls. Not quite as clean, but fuctional.

I know this is cart before the horse, but with with the VoIP on the CIX 40, it would be better to have each site without duplicated extensions so you can dial the other site's extensions directly.

The IP cards, either the GIPU or the MIPU will work fine through a VPN, or outside the firewall with a public IP. There are PROs and CONs to each solutions;

With the IP cards outside the firewall you could use the same card for VoIP phones through the Internet without using VPN routers from the users homes.

Some functions, like BLF accross the network, and SMDI and softkeys for centralized voicemail (except the buit-in GIPH VM which does not use SMDI over LAN) will require that the Processors of each system also see each other, which would be easier if they were on private networks with a VPN tunnel.

Inside VoIP phones should work with IPU inside or outside the firewall.

The new Strata messaging voicemail (if you ever wanted a more feature packed voicemail system) connects to the CIX 40 using VoIP lines, so the IPU should be on the private network.

The IPU cards can also be used for SIP trunking. I don't think it matters if the cards are inside or outside network.

I'm sure you know about VPN adding a bit of overhead to the traffic. Uncompressed VoIP is about 100Kbps per talk path. About 20Kbps for G729A compession. If bandwidth is an issue, the quality of voice may degrade. Delay and jitter are just as bad as poor badwidth.

All this may be much more then you needed/asked for. Thought I'd give a little info up front for when you plan your network.

good info newtecky

those are most of the commonly asked questions.