Hypothetical question for the Toshiba experts?

A customer has a 424 B with a 4-wire EM T1 service into it, with a standard setup for DID users. They have included their fax server and fax machine on 2 separte analog station ports.

Outgoing fax works fine, no issues; however, inbound is a different story. Intermitantly the fax transmission is interrupted and only partial info is avaliabe on the fax.

If memory serves a 4-wire EM T1 is voice grade only and although a fax can work over voice-grade POTS service it was never supported over T1.

Here is the real question:

Is it possible that an incomming fax is presented to the 424, it signals the CO that it is ready to receive and the call is presented; however, during the transmission of the fax the system mis-interprits the various and specific tones received as an FSK signal for disconnect supervision and shuts the port down thinking the call had been completed. Meanwhile the CO still has the call nailed up because it has not received the disco signal from the originating end?
The caller shows the fax complete; however, the 424 had dropped the connection and only partial information was presented to the fax.

I guess an easier question would be, are fax transmissions supported over an analong station card with 4-wire EM T1 services on a 424?
Is it supported using PRI, and are PRI services supported on a 424

Thank you in advance for any assistance

Who's providing timing? The DK or the other end?

CO is Master, or the primary clock source, I guess it all depends on where you are from as to what you call it....right

Did you complete program *42-1?

I am a vendor, just not the vendor. I did not install or program this system.
I have no idea what programming has/has not been done, nor do I know much about the 424. I was brought into this as a 3rd party-non objective to assist with a resolution due to my extensive background in Teleco services. I guess the service provider wanted some direction, either way. So, based on some investigative questioning with the end-user, vendor and the service provider I now have an idea of what they want to do and what they have done thus far...only I do not know the programming to know if what the vendor has done is accurate or if it is even possible.

My main goal here is to assist the end-user, with the level of frustration she has experienced thus far, she has feels that she has no other options and is reaching out for any help where ever she can find it. She is the one held hostage here, not the vendor and not the service provider...I just wanted to try and help.


Can you tell me what program *42-1 is and how it may affect what the customer is trying to acomplish?

*42 sets the clock source. This might be a clocking issue which can cause slipping. Sounds like this might be the case.