ISDN Problems - PBX Info :: Your Free PBX, PABX and Telephone Information Resource

baldwb · 03-20-2008, 10:44 AM

Hi all,

Just cut over from PSTN to ISDN for serveral reasons and I now have the following questions.

Firstly, I am in Australia, Telstra have supplied 3 NT units "NT1"s, one for each PSTN line I converted.

The problems I face now:

- Do I use S or T links (in regards to the DIP switches on the MFU and the radio buttons selecting T Q or S in BMS)
- Incoming callers either get a busy tone straight away or a "number not connected message"
- Is the ISDN equipment connected on a S-bus or directly into the NT?

If I press 700, it calls out on Number 1, If I press 701, it calls out in Number 1. How can this be configured for 700 - prime ISDN number 1, 701 - aux ISDN number 1, 702 - prime ISDN number 2, 703 - aux ISDN number 2 etc...

nitnix · 03-20-2008, 11:13 AM

HI Baldwd,

firstly you have to use "T" interface
callers will get the busy or number not in use tone until you interface it to the MFU and configure it correctly

baldwb · 03-20-2008, 10:40 PM

Thanks for that. What about programming the ISDN trunks? I have not touched anything apart from 1034 Public dialtone to extension and assigning the traffic groups. Is there anything I need to allow the system to accept 'incoming' calls as I can dial out on all lines 100% OK.

Answering position is set to designated extensions. Interface type is set as T and all the rest is defaults.

In other words, am I able to grab some help in interfacing these trunks?
As I said above, I can call out on all of them, but no one can call in.

baldwb · 03-24-2008, 03:34 AM

Im still pretty certain id have to use the S interface as this is ISDN BR not PRI, there are only 3 physical ISDN lines here (6 numbers in total).

Zoran · 03-25-2008, 04:48 PM

ISDN On-ramp2 usually is T interface (unless you ordered S interface) therefore no changes is necessary on BTU-B or MFU card. Check in your order, have you ordered point-to-point ISDN interface (Telstra default is point-to-multipoint). With this second Telstra settings you will have a lot of problems.
To make this to work on incomming calls, set commands 1925-1929 on new links to 8 (strip all 8 digits). Then, on each individual trunks on command 1802 insert any spare 2 digit number and enter same number on command 1802 to make this common number for this line. Set your answering position with commands 1101,1103 (day) and 1102,1104 (night).

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