Voice Over Internet Protocol is a name of a family of technologies that allows transmission of voice over an established network connection. What is usually discussed, though, is Internet Telephony - bidirectional voice (and lately video) transmission over public networks.

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Open source chat protocol that handles voice & video?

I'm looking for a chat protocol which: Has easy to use clients which will run on both Windows and Linux. Has a server which I can run myself on Linux (preferably easy to set up). Supports duplexed ...
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What does a device with 4 FXS mean?

If an analog telephone adapter is advertised as having 4 FXS ports, what does that mean to me? Can I connect 4 different phones to it? If it doesn't have an FXO port, can I connect it to the public ...
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VOIP/Skype/GoogleVoice solution without a PC

In short, I'm looking to drop current VOIP provider (Cablevision/Optimum Voice) and go with cheaper standalone package BUT want to keep existing standard phone that plugs into their box. Does anyone ...
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What is the best way to import and/or sync Gmail-Google contacts with Skype contacts?

What is the best way to import and/or sync Gmail-Google contacts with Skype contacts? Is this even possible?
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best open source software for voice chat in linux [closed]

I recently started working on a project with a remote developer and we want to be able to talk verry easy over VOIP. We are both on ubuntu and have tried using skype, but it gets all kinds of weird ...
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VOIP over double VPN isolation system = bad call quality, solutions?

First of all, I'm not sure that this is the correct Stack Exchange site to ask this question on. I originally asked this on Information Security but was told that because this question involves a lot ...
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I want to connect to my router through wifi and use its pstn phone line

Can anyone refer me where to look I want when I am not at home to connect to my router and use it to call through my phone line (so when I am out of the country I will pay local price to place calls ...
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Can you run DSL and T1 through a single switch for two different purposes?

I'm not quite sure this works, but my co-worker says it will. Details first: We have a small office of less than 10 PCs, and we use VOIP for our business phone line. All PCs require internet access. ...
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How to associate a softphone with a phone url

I'm trying to get click to call to work using Qutecom for a softphone and a Greesemonkey script to turn phone numbers into clickable urls. Whenever I click on the phone number link I get an error ...
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What are the internal workings of Google Voice?

I am new to Google Voice and am interested in how it works internally so I have few doubts about it. Is the Google Voice number itself a SIP number? How does Google Voice receive calls from any PSTN ...
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Any plugins for Skype that support “Soundboard” usage?

I would like to find a program or plugin for Skype that allows you to pipe sound samples in to the outgoing audio stream when you are on a call. Ideally it would have some sort of soundboard ...
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DrayTek 2820 configuration using public IP addresses

I have a /29 range of public IP addresses assigned to me by my ISP. I'm trying to configure a SIP VOIP handset to register with my VOIP provider who recommend using public IP addresses rather than ...