Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: John Higdon Newsgroups: comp.dcom.telecom Subject: Re: Multiple Call-Forwarding Error Message-ID: <2487@accuvax.nwu.edu> Date: 30 Dec 89 04:37:55 GMT Sender: news@accuvax.nwu.edu Reply-To: John Higdon Organization: TELECOM Digest Lines: 36 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 9, Issue 601, message 4 of 7 Miguel_Cruz@um.cc.umich.edu writes: > My phone number (313-663), certifiably a residence, allows seemingly infinite > concurrent call forwards with the regular Michigan Bell call forwarding > service. A little digging reveals that it is not a business/residence matter at all. It is simply a matter of feature implementation in the various switches/generic software releases. When the feature was first generally offered, it allowed unlimited unconditional forwards. When it was found that two numbers forwarded to each other could wipe out the entire trunk bank between the two switches, the generic was modified to allow only one forward. Later, it was realized that simply requiring each call to be supervised before the next was forwarded would prevent a trunk-gobbling loop and this change was folded into the 1AESS generic. My office CO has a 1AESS running the very latest generic (CLASS capable, I'm told) and can multiple forward, while my residence is "served" by an old rusty 1ESS running shareware (I'm told it's actually capable of connecting two telephones together, sometimes) and forwards exactly one call, period. > hear endless clicks as the call gets bounced back and forth, eating > up more and more trunks (or whatever they use for interoffice calls > these days..). If you can actually do this, it indicates that they are running a positively *ancient* generic and deserve to have all of their trunks disabled by pranksters, which I'm surprised hasn't happened already. If that were possible here, the trunks would be gone in an instant because of the SS#7 signaling employed. John Higdon | P. O. Box 7648 | +1 408 723 1395 john@bovine.ati.com | San Jose, CA 95150 | M o o !