From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from homiemail-a21.g.dreamhost.com (caiajhbdcagg.dreamhost.com [208.97.132.66]) by speech.braille.uwo.ca (Postfix) with ESMTP id AFD71C1A0B1 for ; Mon, 7 Feb 2011 22:19:04 -0500 (EST) Received: from homiemail-a21.g.dreamhost.com (localhost [127.0.0.1]) by homiemail-a21.g.dreamhost.com (Postfix) with ESMTP id 8768D300061 for ; Mon, 7 Feb 2011 19:15:43 -0800 (PST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=the-brannons.com; h=from:to :subject:references:date:in-reply-to:message-id:mime-version: content-type; q=dns; s=the-brannons.com; b=J5EvO7BBxG4DmWbHhHqM5 x3zuFKyFQpnNQqLt+HFwAV5t/dYL12cnyC0yqrZB2yueOehZdKR/haWpICShopNV bGvn4ooMVeR3feEi2IKQARGE9PrhnYhRWkxhe6fIMPJ1MkniNFohSnTDBGchX+lx KJRmWBxKk+NQrApDjjGE4I= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=the-brannons.com; h=from :to:subject:references:date:in-reply-to:message-id:mime-version: content-type; s=the-brannons.com; bh=zlPayaNmNMh1kRpG5PyQWKHsGYI =; b=vt4+i0C93AO3qXH0aJ9gveIJOFn4/4tl5ppfzTu3CkPRrk/McsAB1D1UrOS Zv+KBoCSl0AzUF/cgAexOWMab6EurwW7xelBI/rSRZXriHrkPdLEZzCixO7B7nqa 0ox/8jXyn27p4xrGYqMpp8qIEfKQ36bVnZBe59KIsYeiG8SY= Received: from localhost (ip68-12-125-253.ok.ok.cox.net [68.12.125.253]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: chris@the-brannons.com) by homiemail-a21.g.dreamhost.com (Postfix) with ESMTPSA id 4C855300059 for ; Mon, 7 Feb 2011 19:15:43 -0800 (PST) From: Christopher Brannon To: "Speakup is a screen review system for Linux." Subject: Re: a note for linphone users who want to use the freeswitch server References: <87hbcfqubo.fsf@the-brannons.com> <20110208025556.GA30573@linux1> Date: Tue, 08 Feb 2011 03:15:42 +0000 In-Reply-To: <20110208025556.GA30573@linux1> (William Hubbs's message of "Mon, 7 Feb 2011 20:55:56 -0600") Message-ID: <87d3n3qkrl.fsf@the-brannons.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-BeenThere: speakup@braille.uwo.ca X-Mailman-Version: 2.1.13 Precedence: list Reply-To: "Speakup is a screen review system for Linux." List-Id: "Speakup is a screen review system for Linux." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Feb 2011 03:19:04 -0000 William Hubbs writes: > There used to be music that played when you entered the conference and > were the only one there; that may be a good reason to think about > bringing it back some how. If there's nobody there, I would personally rather hear silence, so that I can play a stream of my choosing. Plus, playing music wastes bandwidth. Note that the problem also occurs if the other participants mute their outbound audio. I.E., no audio is being sent by the server. The best solution is a keep-alive message of some sort. I.E., every X number of seconds, the freeswitch conference module sends a packet to every connected user, saying "Hey, I'm alive". SIP doesn't have a keep-alive feature. linphone automatically disconnects when X seconds have elapsed since the last RTP packet. The default value of X is 30. RTP is the protocol which actually carries the audio (or video) data. So here's the question. Would it be possible to send an RTP packet consisting of nothing but silence to every participant at a given interval? This wouldn't require much bandwidth, and it would give us the equivalent of keep-alive. -- Chris