slagburn

New install or production system that just went broke one day? Any odd PRI / BUG codes?

Without the intervention of SBC (CTG I presume) will any calls process?

When SBC isn't doing anything (out of the span) do you see any incoming setup messages on the DCH?

If I'm reading your post correctly every call after 5 callers have established fails? Do you see any incoming setup messages on the 6th caller and beyond? Can you post them?

Do you have access to a T-1 tester with PRI capability? Personally I'm not a big fan of SBC (the carrier side) testing stuff... not that they aren't good at it but they seem to deal with such a wide variety of CPE that they often miss the details of what each one needs to function correctly.

Ttom

Production System. Calls process without any intervention; however, they seem to be limited. Is it possible that something in the 11c is acting up. As far as I know the TMDI is self contained. No tone and digit card required. If I looked into this and sent and recieved hit 8 would their be any correlation? This this worked great for a couple of years. Last month I had a similar problem. I reloaded with no apparent success. I repowered the csu's after they saw problems on their NIU's and replaced their cards and for 1 month no problems. Now with everything done this time no problem. Besdes the resolve to a problem that shows no bugs no other errors. I dont know. Its a real problem not imagined.

slagburn

Provided that MTC and BUG are enabled on the interfaces you're looking at the absense of error codes on the PBX would lead me to believe that the problem lies with SBC more than the PBX in that the calls might not even be hitting the PBX so no reason for an error or the incorrect number of digits are being sent from SBC.

When callers are getting a not able to connect message do you ever see a incoming setup message from the CO on the DCH? In other words are you sure the calls are actually getting to the PBX and being blocked at the PBX? Do you see any reject messages going back out from the PBX?

Typically COs will not return a fast busy but the carriers put all sorts of funky stuff between the CO and the CPE that can return a fast busy, most of which they never talk about.

And just because you're dealing with TMDI cards have you reseated and force downloaded them recently? Odd that the problem would happen on two at the same time but stranger things have happend and these are TMDI cards...

Buckshot

I have seen something very similar this before on a couple of T1's at a site (not TMDI tho). The problem was in the slick up the street. One of the power supplies failed, leaving only half the slick up an running. The half was supplying DT to the entire industrial complex. Apparently, a lot of other customers were complaining, but the local telco took 2 days to figure out it was weird everyone in the complex was calling. DUH!

One of the things I did to make sure the problem was not on my card or systems, was to disable a bunch of my channels, and forcing them to move up or down on the T1 cards. That told me that my channels were good, and the problem was on telco side. Have you tried that?

Also, have you checked to see if there are patches for anything of this nature?