Path: utzoo!utgpu!watmath!att!tut.cis.ohio-state.edu!brutus.cs.uiuc.edu!wuarchive!texbell!vector!telecom-gateway From: bovine!john@apple.com (John Higdon) Newsgroups: comp.dcom.telecom Subject: Re: Call Progress Signals Needed Message-ID:Date: 15 Aug 89 01:11:16 GMT Sender: news@vector.Dallas.TX.US Reply-To: bovine!john@apple.com Organization: ATI Wares Team Lines: 18 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 298, message 10 of 12 In article , userDBUG@ualtamts.BITNET (Dan Berry) writes: > I was interested in finding out the tone plans for the typical phone > system's call progress signals, but I can't seem to be able to find > them in any of my books! You know, the frequencies for a dial tone, > busy signal, ringing and the rest of them. From someone else that > I've talked to, they made mention that only some four frequencies > were used to get some 20+ signals. dB's and timing too, S.V.P. All of the information you seek in the Radio Engineer's Handbook. I don't have my copy at hand, but it's widely available and in it's umpteenth edition. Everything you ever wanted to know about telephony hardware is in that book. -- John Higdon | P. O. Box 7648 | +1 408 723 1395 john@zygot.uucp | San Jose, CA 95150 | M o o !