atcomsystems.ca/forum Forums TDM Business Telephone Systems Toshiba Telephones & Systems Toshiba Network VoIP and Faxing

First of all I am an IT Manager with about three years experience using CTX WinAdmin software for making Adds, Moves, and Changes. This system is on WinAdmin 2.22A.15 and the CTX670 is R2.22 MH214. The CTX100 are at R2.21 MH112, R2.22 MH214, and R2.22 MH214



We have four locations connected in a hub to our corporate office. The connections are Point-to-Point T1's. The main office is a CTX 670 with CTX 100's at each remote site. Between 2 of the remote sites and the main office we use Toshiba's VoIP and networking to connect between the CTXes. The other remote location is larger with more traffic, so we elected to channelize the T1 and use 2/3 for IP data, and 1/3 to provide 8 voice channels.



Since the original setup we have had problems with some (not all) of the Fax machines that use the Channelized T1 for faxing (see problem below). I do not know where to look to fix this, and I have tried setting program 200-Station Data Item 14-Bearer Capability to Speech. Which is how I understand it to work. Perhaps you could explain this better? This never seems to experience a problem over long distance services, only through the T1. Sometimes the problem seems worse than others.



Recently, we began having problems with one of our faxes that goes to the VoIP branches. It works ok if we dial the remote fax over Long distance, but through the VoIP it crashes over 50% of the time. This means the entire fax must be resent (ECM is enabled on the fax) or there are sections of the page missing (if ECM is off on the fax).

Things I have tried:

• Change out Fax machine at both ends.
• Turn off ECM (error correction). -This just make the output have missing text, like packets just didn't make it.
• Change the baud rate. -No effect.
• Re-Punched the wired connections to the fax machine.
• Moved to different wire run/wall plate.

Any suggestions, or do you need any more information?

I'm not sure if your problems can be resolved on a forum. I'm thinking that you'll be better served by having a Toshiba dealer come out and work with tech support if need be. In the meantime, you can check to see if you have the clocking set correctly on your routers or DSUs.

Just curious....What type of Voicemail do you have?
Might it be a IEs32?
Is it Centralized VM?
I also agree with the clocking issue and/or slips.

I had thought of this, and I have discussed this problem with our Toshiba Dealer in the past. It seems that we have checked most things. However, I personally have not checked how the clocking is set.

If I understand it correctly, there should only be one clock source for the whole WAN, or is it one clock source per T1 connection. I would imagine that this would need to be set for each device that touches the T1.

Here are my questions.

• What is the best clock source?
• Does this need to be set in the CSU/DSU as well as the Toshiba Hardware?
• Do the cisco routers also agree upon a clock source?

One other point. The Channelized T1 has its own PRI card in the CTX670. There is also a PRI card for the incoming PRI lines. Wouldn't the Toshiba hardware need to have a clock set to two different PRI sources, in order to accept faxes from the PRI lines, and the WAN T1?

Yes it is an iES32 and centralized VM for the entire organization. How would this pertain to the faxing question? Unless this tells you that we are using Toshiba's Strata Net QSIG Networking. Which I failed to mention.

What are slips?

For the point to point connections, one of the routers and/or CSU/DSUs should provide the clocking and the other should 'slave' off of it. This is done on the routers or DSUs. If you don't have proper clocking you may experience slips in the T1 connection which usually affects faxing.

So I would check this by looking in the router and DSU configs, but what am I looking for? I would imagine that Cisco and Adtran both have different setting possibilities. Most of this type of setup was done by our Toshiba/Cisco dealer, although I have messed with it in the past. I will start with reading the manual. Any pointers would be appreciated.

-Thanks

The following reference is helping quite a bit in understanding how the system works. I haven't finished reading it yet, but it has impressed upon me the importance of getting the clocking right.

https://www.oreilly.com/catalog/t1survival/chapter/ch05.html

In researching my router & CSU/DSU configuration. I found this article that helps decipher some of the clocking setup, for the channelized T1.

https://www.adtran.com/adtranpx/Doc.../CU-eeb6a97ee79511d68ff2010a4b3bbde.html

Faxing over VoIP (QSIG or from the MAS) is not supported I am told by Tech Support

red