From owner-freebsd-isdn Mon Apr 13 01:26:04 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id BAA02539 for freebsd-isdn-outgoing; Mon, 13 Apr 1998 01:26:04 -0700 (PDT) (envelope-from owner-freebsd-isdn@FreeBSD.ORG) Received: from linteuto.teuto.de (linteuto.teuto.de [194.77.23.26]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id BAA02523 for ; Mon, 13 Apr 1998 01:26:01 -0700 (PDT) (envelope-from martin@rumolt.teuto.de) Received: from rumolt.teuto.de (root@rumolt.teuto.de [194.77.23.161]) by linteuto.teuto.de (8.8.8/8.8.8) with ESMTP id KAA09284; Mon, 13 Apr 1998 10:25:57 +0200 Received: (from martin@localhost) by rumolt.teuto.de (8.8.8/8.8.7) id KAA01197; Mon, 13 Apr 1998 10:14:15 +0200 (MEST) From: Martin Husemann Message-Id: <199804130814.KAA01197@rumolt.teuto.de> Subject: Re: Callback To: blaz@gold.amis.net (Blaz Zupan) Date: Mon, 13 Apr 1998 10:14:15 +0200 (MEST) Cc: freebsd-isdn@FreeBSD.ORG In-Reply-To: from "Blaz Zupan" at Apr 12, 98 01:01:25 pm Organization: Crusaders Catering Services Inc. X-Mailer: ELM [version 2.4 PL24] MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Sender: owner-freebsd-isdn@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > Is my assumption correct, does i4b callback only work with setups where > the remote end returns a busy on the dialin? Yes - otherwise you'll pay for the connection, at least here in Germany. Most routers support two kind of callbacks - the one that i4b supports means: the called system rejects (so no charge for this connection), waits a configurable time and the calls back. Information on who has called and who is to be called back relies on the ISDN calling party number information and stuff statically configured in the routers (or isnd's) configuration. The other type of callback (not supported by i4b right now) means: the called system accepts the connection and starts ppp negotiation. During this the ppp's aggree to do a callback. Information on who called in and who is going to be called back is subject to the authentication/negotiation already done by the two ppp's. Then ppp closes down, the connection is disconnected and the called system calls back. I've never seen someone actually use the second type due to its obvious disadvantages. It may be usefull if you travel, call in from an unknown number and want to be called back at that number. Martin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message