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TECHNICAL DATA & TROUBLESHOOTING | 79
In the case of Natl.I-1 or 2, and DMS-100 carefully verify that you have the correct SPID from
the Telco, and that you have properly entered it into the system. It must be correct in order for
anything to work! We’ve seen a few cases where it was given incorrectly by Telco personnel, so it
might be a good idea to re-check with them if things are pointing in this direction.
Hot Tip
If you suspect the SPIDs given you are wrong, or the basic line provisioning (conguration)
is incorrect, call the Telco and ask to speak to someone who can “log into the switch”. They
will probably need to have someone call you back. Only once you have this person on the
line, and they are logged into the switch, ask them to look at the SPIDs programmed there.
Also get this person’s fax number and send them the ISDN ordering information form the
Appendix of this manual.
Sometimes the information in the business office computer is wrong. By verifying what is
programmed into the actual switch, you can save time. e AT&T PTP protocol generally
does not allow two simultaneous voice calls. For this reason we recommend that the National
ISDN-1 protocol be used if you are on the AT&T/Lucent 5ESS Telco switch.
We’ve included some useful diagnostic aids in the system to help you determine where a
problem is originating. A good starting point is the ISDN status, accessible on the LCD by
pressing any menu button twice.
Condition: System says Ready but attempted calls do not complete
(goes back to Ready or stays at Seize pending)
Are your SPIDs and Telco setting correct?
Can you dial from Line 1 to Line 2?
If you can successfully call from one line to the other, you know that your SPIDs and ISDN
protocol settings for that line are correct and that the ISDN circuit itself is ok. Try a call to
another local number.
If you cannot complete this call try dialing with a 9, 8, 7, or 6 before the number. Sometimes
ISDN lines are set up as Centrex service even if you did not request this.
Is your long-distance carrier OK?
If you can successfully call locally, but long-distance calls don’t go through, the Nx12 usually
displays Far end disconnect, or No route available as the ISDN “Cause” phrase.
You may try another by dialing the appropriate 10XXXXX prefix (in the USA & Canada only).
In the USA you can determine who your long distance carrier is by dialing 1+700+555+4141.
If Intra-LATA long distance competition has reached your area you can determine your Intra-
LATA long distance carrier by dialing 1+area code+700+4141.
What does the ISDN “Cause” phrase say?
is phrase, which will appears on the ISDN protocol log after dialing, comes directly from the
telephone company equipment, and can be valuable for troubleshooting. Generally, these phrases
are self-explanatory. Getting them means you are at least talking to the Central Office equip-
ment. ere is a full description of the phrases in Section 6.7.