Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!usc!apple!bionet!hayes.ims.alaska.edu!accuvax.nwu.edu!nucsrl!telecom-request From: john@bovine.ati.com (John Higdon) Newsgroups: comp.dcom.telecom Subject: Re: Dialing Own Number Brings a Surprise Message-ID: <15088@accuvax.nwu.edu> Date: 29 Nov 90 08:58:24 GMT Sender: news@accuvax.nwu.edu Reply-To: John Higdon Organization: Green Hills and Cows Lines: 42 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 855, Message 4 of 11 On Nov 28 at 22:22, TELECOM Moderator writes: > [Moderator's Note: Whoever wishes to answer Brian's questions can > answer one for me also: How come if I have call-waiting on my line > dialing my own number does not produce a call-waiting signal instead > of a busy signal? Simply put, when you dial your own number, the test for busy is technically performed before you have finished dialing. You have a 1AESS, if memory serves, so you can hear some of the call states quite well. In older generics (and some newer non-Pac*Bell ones), call waiting and three-way will not work until the "ka-chunk" -- the time when you are connected with the interoffice trunk or the other number in your switch. When you dial your own number, your line is tested for busy, and the action is taken based on the instantaneous condition of your line (i.e., off-hook, dialing) which is "send to busy trunk". Call waiting has not yet been enabled. > I notice if I go out of my CO to do it, i.e. I use > my phone to dial my 800 number which comes back to ring on the same > line then I *do* get a call-waiting signal. Likewise a call to > 10835-1-700-my number goes out to Telecom*USA, comes back and gives me > a call-wwaiting signal. Dialing my own number direct returns busy. > Why? PAT] When you do that, your switch is out of the picture. You dial, finish dialing, "ka-chunk" (you are connected to the IEC trunk) and the carrier routes the call back to your number. At that moment the condition is different than the above. You are off-hook, dialing completed, connected to trunk. Action taken: switch you to conference trunk, send tone, send RBT to caller. Pac*Bell Weenie Note: In the Pac*Bell implementations of the 1AESS (W.E. should never have provided them with the source!), you would still get busy, even when dialing through Telecom*USA. PB's generic will not allow CW or 3W until the first call is supervised. Pac*Bell had some lame reason for doing this, but I forgot what it was. John Higdon | P. O. Box 7648 | +1 408 723 1395 john@bovine.ati.com | San Jose, CA 95150 | M o o !