cmoore@brl.mil (VLD/VMB) (11/08/90)
An earlier note said that 570 thru 574 were, in the pre-split 312 area, the ringback prefixes. By 1982, however, 570 was an Evanston prefix, and it and all the other above-mentioned prefixes were apparently in use at the time of the 312/708 split, and all of them moved to 708. Are 570 thru 574 assigned to anything in the PRESENT area 312? [Moderator's Note: Well actually, the correct numbers are 1-571 through 1-577. No area code, but you must use 1 plus the appropriate three digit code for your CO (571 through 577) plus the last four digits of the phone you want to ring back. For example xxx-2368 would be rung back by dialing 1-571-2368 (or 572, 573, whatever applies in your office -- test 'em all to find out which!) The corect combination will return dial tone. Flash the hook. The dial tone will change to a high pitched tone. Two tests are possible: To test the accuracy of the touch tone pad, punch in 1,2,3,4,5,6,7,8,9,0. If the tones issued are at the correct frequency, you will hear a double spurt of tone: Dah-dah! Test two: Dial 6 and hang up. The phone will ring back. PAT]
normt@ihlpy.att.com (Norman R Tiedemann) (11/10/90)
In article <14476@accuvax.nwu.edu>, the Moderator notes: > [Moderator's Note: Well actually, the correct numbers are 1-571 > through 1-577. No area code, but you must use 1 plus the appropriate > three digit code for your CO (571 through 577) plus the last four > digits of the phone you want to ring back. For example xxx-2368 would > be rung back by dialing 1-571-2368 (or 572, 573, whatever applies in > your office -- test 'em all to find out which!) The corect combination > will return dial tone. ... Here at Bell Labs in Naperville, we have ISDN from IBT. This ring back does not work through ISDN. Interestingly enough the phone number voice back (1-200) works. Actually, it voiced back your number very quietly and then give a loud annoying fast busy. You have to pull your ear away fast after the number. Anytime I try the ring back, it rings and then I get the intercept tone and the "To call a number outside your area code, dial 1 plus area code ... To call a number within your areacode just dial the seven digit number." I also noted that the touchtone test will not work if you do not subscribe to touch tone service. (Or at least I couldn't get it to work at home.) If anyone knows how to ring back through ISDN, I'd be interested in finding out how. Norm Tiedemann AT&T Bell Labs IH 2G-419 att!ihlpy!normt 2000 Naperville Rd. normt@ihlpy.att.com Naperville, IL 60566