[*] StarStar Me: Using your name as your phone number
Adam Thompson
athompso at athompso.net
Fri Jan 25 16:41:46 CST 2013
> Funny thing the biggest problem with our project was getting it to
> work with the UofM's PBX via PRI (we weren't getting the dialed
> number).
[Note: I'm going from memory here, about stuff I knew about 15 years ago, and some of it was hearsay even at the time: don't quote me!]
That would be because the UofM was running a Meridian Option 81 upgrade on an old SL-1 frame, not an 81C. The old '81 never really understood ISDN the same way the rest of the universe did; it (IIRC) was incapable of handling NI-1 modes, and it was particularly bad at running point-to-point trunks in any configuration other than as the main inbound/outbound trunk from a DMS-100 or a DMS-1. The C ("compact") variants modernized the ISDN support, from what I remember. I don't think they upgraded to an 81C until the late 2000s.
If you were running channelized T1 instead, you'd have had similar problems because the T1 cards could only do ANI/CLI or DNIS, not both. (In fact, even a DMS-100 couldn't do both ANI and DNIS simultaneously on a T1 without designating the line a "911 trunk", which then ignored all privacy settings! PRIs worked as expected, assuming the switch and your CPE had a matching ISDN profile.)
-Adam Thompson
athompso at athompso.net
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