Path: utzoo!telecom-request Date: Wed, 5 Jun 91 08:56 PDT From: John Higdon Newsgroups: comp.dcom.telecom Subject: Re: Modification of Ringback Tone by Subscriber Apparatus Reply-To: John Higdon Message-ID: Organization: Green Hills and Cows 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 427, Message 4 of 9 Lines: 19 Tom Gray writes: > The double ring will indicate that the destination has answered your > call on its own equipment. The real implication of this is that you > are now being billed for the time that you are listening to ringing. Not generally true. If the reason you are hearing an unusual ringing signal involves a PBX, it is probably a DID connection. Answer supervision occurs when, and only when, the call is picked up by the ringing extension. Busy, no answer, and even local customer intercept recordings do not return supervision on a properly set up PBX. In essence, the PBX becomes the terminating CO. John Higdon | P. O. Box 7648 | +1 408 723 1395 john@zygot.ati.com | San Jose, CA 95150 | M o o !