Path: utzoo!telecom-request Date: Mon, 17 Jun 91 15:27:30 PDT From: hildum@ariel (Eric Hildum) Newsgroups: comp.dcom.telecom Subject: Re: Modification of Ringback Tone by Subscriber Apparatus Reply-To: ntmtv!hildum@amdahl.com (Eric Hildum) Message-ID: Organization: Northern Telecom (Mountain View, CA) Sender: Telecom@eecs.nwu.edu Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 467, Message 1 of 9 Lines: 26 In article covert@covert.enet.dec.com (John R. Covert 05-Jun-1991 1440) writes: > Specifically, 416 392-7715 rings with double ring, but you are not > billed until someone answers. I have verified this from a trunk which > provides positive indication of answer supervision. Soon, this will no longer neccesarily be true (at least in the USA.) According to recent changes to FCC Part 68.314(h), when a DID call is forwarded out of the receiving switch, answer supervision will generally be returned after about 15-20 seconds (final value yet to be determined), regardless of the actual state of the call. This change was made at the request of the service providers; they felt that they were losing significant sums of money delivering DID calls to PBXes which, due to misprogramming or forwarding of calls over nonsupervisory trunks (eg, out to the public network again), did not return answer supervison when the call was actually answered. The upshot of it all is that you will no longer be able to tell from the call progress tones what the billing status of the call actually is. Eric Hildum Standard disclaimer here (I really don't know what I'm talking about)