Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: Donald Krapf Newsgroups: comp.dcom.telecom Subject: Re: What Would it Take For Modems to Recognize Call Waiting? Message-ID: <11655@accuvax.nwu.edu> Date: 3 Sep 90 22:36:41 GMT Sender: news@accuvax.nwu.edu Reply-To: Donald Krapf Organization: The Voice of Fate Lines: 23 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 616, Message 2 of 8 In article <11471@accuvax.nwu.edu> John Higdon writes: X-Telecom-Digest: Volume 10, Issue 605, Message 9 of 10 >Steck Thomas writes: >> voltage changee - simply a tone introduced to the line. There is no >> true interuption of the line and no 'switching' sounds (clicks, etc..) >> like there used to be. >But even on these digital switches, the talk path is interrupted for >the duration of the "beep". In most cases, this is enough for a modem >to consider that there has been carrier loss and to hang up. There may Most modems can be instructed to ingore carrier loss for a brief period. The only problem here is that the modem at each end must be so instructed. When I have control of both ends of a line I typically instruct the modems to tolerate a carrier drop of up to three seconds. Don