Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1+some 2/3/84; site dual.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!ut-sally!mordor!dual!paul From: paul@dual.UUCP (Baker) Newsgroups: net.followup Subject: Re: Telecomm rates? Message-ID: <825@dual.UUCP> Date: Thu, 4-Oct-84 23:57:16 EDT Article-I.D.: dual.825 Posted: Thu Oct 4 23:57:16 1984 Date-Received: Sat, 6-Oct-84 02:15:30 EDT References: <3791@decwrl.UUCP>, <649@hound.UUCP> Organization: Dual Systems, Berkeley, CA Lines: 14 Central offices do not and do not need to know if a modem is being used. On the other hand Echo suppressors that are used to prevent you hearing your own voice returned after a few seconds on long lines, need to be disabled for a full-duplex Modem to work. It does this by detecting the answer tone given by the Modem. Note that this is the same tone for all Bell standard Modems. Digital central offices are in no better position to interpret information passed through them. There does seem to have been an interest in the past by phone companies to try and charge Modem users more than voice users. So far none of them have been successful. Paul Wilcox-Baker