atcomsystems.ca/forum Forums TDM Business Telephone Systems Toshiba Telephones & Systems LAYER 3 STUFF

I have a client on a PRI from Charter Fiber they have switched from pots line service to a full PRI. One of their departments (originally had only 4 pots lines) was being overrun with calls I programmed call by call and 4 GCO keys limited the number of inbound calls to 4 that took care of the incoming call volume problem but now on the 5th call we are getting an intercept from the carrier saying "your call can not be completed at this time" the customer wants a simple busy signal. does anyone know what layer 3 message the CIX 100 R3 sends in this scenario. I'm trying to sound like I know what I'm talking about when I approach Charter

Wow 146 views and no responses. Have I stumped the band on this?

Did you assign just 4 channels for the ILG in the call by call section?

Correct and on the 5 inbound call instead of a fast busy you get an intercept saying your call can not be completed at this time i’m trying to figure out what message the CIX is sending to the carrier on the D Channel

Have you done a Hyperterminal trace of the call off the PRI card?
This will show you what the CIX100 PRI card is sending back to the exchange.

Interestingly in the Toshiba KB they have a KB regarding Call-by-Call to limit calls on a PRI with the subject "Fax busy work around for the CTX with PRI only".

Toshiba has a Digitrace utility to capture ISDN messages, but it works about the same as Hyperterminal (or TeraTerm or Putty). That is probably the best way to find out what messages are being sent back to the carrier. You could ask the Charter techs what they see, but the chance is probably pretty low that they will be able to tell you.

Have you tried reducing the B channels to 4 channels?

The only difference between Digitrace and Hyper Terminal/Putty/Hercules etc is that it is date and time stamped to help with finding the data quickly.

Connect a TTY cable onto the monitor port of the RPTB/BPTU card and set your capture software to 9600 baud rate, 8 bits, No Parity,1 stop bit and set it to capture the data to a text file.
If you are unsure what you see then send it to one of us to decipher for you.
Tell us the DID number you are dialing and the number you are dialing in from.

You will have stumped most but not all of us

I have spent a lot more time looking at SIP trunk messages then I ever did looking at Q.931 messages.
Typical PRI turnup:
4 Digits - Check
NI2 - Check
B8ZS/ESF - Check
Test call. Done

Worse case I still use a third party PRI trace utility that does a great job of visualizing the PRI channels. That way I can tell the telco: "Nope, the call didn't hit my PBX. Check your stuff again".

Reducing the b channels to four would have a global effect
They have multiple departments.