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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Using Ekiga from a hotel

Since Skype crashes whenever someone signs in, signs out, or sends a chat message, it has become unusable and I need to change. A post at AskUbuntu lists Ekiga as an alternative. When I try to use ...
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252 views

How many users could I host on a VOIP server running on my home internet connection?

I have 25 Mbps on the downstream and 2 Mbps (250 KBps) on the upstream. I imagine upload speed is most important. For a very high quality TeamSpeak audio codec, bandwidth transfer for a single user ...
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451 views

What is the difference between VOIP and Internet Telephony?

These terms are often used interchangeably. Is there any difference the two terms, or is one of the terms subset of another?
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1k views

Send and receive phone call and SMS on a computer?

I am currently in mainland China, I want to send and receive phone call& SMS on a computer. I tried Google Voice as well as Skype. Their outgoing call is all right, but it seems impossible to get ...
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4answers
28k views

How can I use a fax machine over WiFi?

I have a fax machine in a location that is accessible only through nearby WiFi. I'm in an unusual situation where it must be an ancient fax machine and not a nifty eFax solution (much to my chagrin.) ...
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2k views

How can I stop Raid call from loading when I start my computer?

Every time I boot into Windows, Raid call automatically starts. Is there a way to stop Raid Call starting whenever I boot up my computer?
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2k views

Asterisk Has Consistent 100% CPU Load On One Core

http://i.imgur.com/sySQfsH.png Please note the screenshot. I have an Ubuntu 12.10 box running Asterisk. I ssh'ed into the server the other day to find asterisk running at 100% CPU on one core, and i ...
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697 views

how to reduce h264 annex B NAL unit sizes to avoid IP fragmentation?

I'm trying to stream a video over to a terminal using RTP. The video is coded in h.246. I'm using ffmpeg to extract the byte stream according to h.264 annex B : ffmpeg -i test.h264 -vcodec copy -vbsf ...
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386 views

Will I need to put a filter between a ADSL router and a phone?

I have a Naked ADSL connection (no dial tone, connects to ADSL internet only) with an ADSL router plugged directly into the wall. All calls are made using the VOIP ports on the ADSL router. Should I ...
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2answers
135 views

Do I need to subscribe to a VOIP service if I have a VOIP server configured?

VOIP has caught my interest today as it seems to be a great solution for somebody who travels frequently and needs to make cheap/free calls from wherever. I know I can setup my own PBX server with ...
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570 views

VOIP (Skype, Lync) 'stutters' with my ISP. How can I prove it?

When I am on VOIP calls (Skype or Lync) most of the time the calls suffer quality issues where the person on the other end cuts out. 4 perfect seconds, then 1 to 1/2 a second of what the other person ...
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3k views

Sharing a wireless network connection with a wired connection

I have a need to setup a VoIP phone that needs to be plugged into a wired net. However, I only have wireless Internet access as the modem/router are upstairs and not accessible to the phone. I have a ...
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972 views

Is there a mature, reliable VoIP client in Windows RT? [closed]

I am considering purchasing a Windows RT device. I currently use Bria on my IOS devices, which works pretty well (except for battery life). Anyway, I noticed on CounterPath's website, that they do ...
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254 views

Why do I need a managed switch and which one should I buy?

I bought a 2nd router and I want both routers to have direct WAN access to the modem. One of the 2 routers directs VOIP traffic to a telephone line port. This VOIP service is provided by the cable ...
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118 views

VLAN & VPN for IP Phone [closed]

I have a LAN with some IP phone and some PCs. This LAN is connected via VPN to another office. For several reason I cannot change the IP address of the IP Phone (static) and for the PCs (DHCP): the IP ...
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2answers
1k views

Sipura / Linksys / Cisco SPA3102 problems with analogue phone

I have bought 2 of these SPA3102 - One direct from china(verified original) and one from Ebuyer UK but it is called SPA3102 -UK I find this guide and followed it I am only going to talk about the ...
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1answer
578 views

How to establish SIP connection, when SIP-proxy is required?

I have Asterisk/1.8.13.1 Asterisk GUI-version : SVN--r Yes, quite old one, but I can not update it since this is installed on my Synology NAS. NAS is connected to internet thru router Asus RT-N16. ...
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242 views

Asterisk distribution with very fast deployment [closed]

I have zero experiences with Asterisk but need to choose the best bare-metal distribution (running as a VM guest) for my needs. Asterisk server will answer calls, auto responder says caller ...
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2answers
558 views

Is there such thing as a software switchboard for Trixbox/freepbx/asterisk? [closed]

We use Trixbox CE and would like something so that we can load a window that tells us which lines are in use around the office. Currently no need to use it to actually make calls or anything, but just ...
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1answer
335 views

Asterisk extensions.conf confusion

Hopefully someone out there has an answer, but I have a couple lines in an existing configuration I need to fix and with a somewhat weak understanding of how Asterisk works. First off, I have a ...
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1answer
683 views

What does it mean to 'unlock' a VOIP adapter?

I'm thinking about buying VOIP adapter for home use. I already use SIP software on my PC and Mobile, but i think it would be easier to just pick up the phone at any time and call. And I could recycle ...
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483 views

fail to reload module res_odbc.so in asterisk server

I configure my /etc/asterisk/modules.conf file with following code: [modules] autoload=yes preload => res_odbc.so preload => res_config_odbc.so After that, i went back the CLI console to ...
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164 views

SIP load balancing

Folks, we own a set of phone numbers which we have routed to our VOIP provider. In turn, they forward the calls to our Asterisk box coloed in their datacenter. Is there any possible way to get ...
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550 views

Can I use a Bluetooth headset with my Windows desktop/laptop for Skype or other VOIP applications?

Can I use a Bluetooth headset with my Windows desktop/laptop for Skype or other VOIP applications? I am considering purchasing a MOTOROLA H730
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623 views

Is there actually a way to make video calls through XMPP/Jingle WITHOUT Google Talk?

Good day people, I'm writing because I've spent the whole day trying to make video calls through XMPP but I haven't really found out if it's actually possible. There are many clients which ...
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232 views

How to run secure voip traffic without using vpn

I use quintum tenor for voip traffic using VPN SSL Tunnel. VPN server is based in another country. VPN used enough bandwidth, and we need to reduce bandwidth consumption. Is there any SECURE way to ...
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409 views

What other ports should I block to maximize server security? PS using IPTABLES

I have blocked ports 80, 9001, 9080. What other ports should be blocked to maximize security? PS: It is a asterisk server / PBX Sorry: New Systems Admin here :) Thanks!
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2answers
379 views

Can Microsoft's Lync VOIP functionality be scripted?

My employer uses Lync for all of our desk phones, and one of the features of Lync is that you can set your phone number to forward to another, say your cell or home phone. To do so, you have to ...
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24 views

What does a device with 2FXS & 2 FXO mean [duplicate]

Possible Duplicate: What does a device with 4 FXS mean? as title, What does a device with 2 FXS & 2 FXO mean is it mean that i only can connect to 2 phone? thanks
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1answer
131 views

What hardware device do I need so I can connect my phone with an ethernet jack to my wireless internet

I have a telephone which has an ethernet jack in the back (it uses VOIP). It will sit on the 2nd story of my house. My wireless router is on the first floor of my house. What wireless ...
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2answers
66 views

Sending voicemail to email inbox [closed]

Is there any software that makes it possible to send voicemail from a specific cell phone or Skype number to a specific email address? I'd like to be able to check my voicemail and email at the same ...
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4answers
489 views

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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865 views

Asterisk PBX - Transfer nuisance calls to special extension

I'm using asterisk 1.8.14 and freepbx 2.10. I keep getting telemarketing calls and want to do the following when they call. Have a special extension number I can manually transfer the calls to The ...
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387 views

X-Lite v4 softphone doesn't show up onscreen in Windows 7 (only nonfunctional tray icon)

I installed X-Lite on a 64-bit Win 7 machine. Install seems to go smoothly, then when I launch the application, its splash screen appears, then it goes away, leaving a tray icon with the familiar ...
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126 views

How should I choose a VoIP provider? [closed]

Suppose you want to select a VoIP provider that would make possible for you to make calls from your computer to regular phones. Where would you look for names, and what sources or criteria would you ...
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62 views

What should someone look for when selecting a sip registrar?

Is there any relevant differences between providers that you should look for? Or they are basically all the same and you just choose the one that you like the name more?
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123 views

google-voice not working outside of gnome

I got google-voice working in ubuntu under Gnome. But for some reason when I log into my WM, Xmonad, google voice doesn't recognize my webcam. Do I need to run some daemon or app along with my WM to ...
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364 views

One VoIP conversation but two RTP streams?

I'm testing a VoIP system based on OpenSIPS. It has no RTPproxy, so calls do not pass through OpenSIPS. I tried to make a call between two smartphones, and it succeeded. I also turned on Wireshark, ...
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Why G.722 has 64 kbps bit rate?

I'm learning a few things about codec, and now I'm confused by G.722. There's a way to calculate codec bit rate that I read here on wikipedia. It said: bit rate = sampling rate x bit depth G.722 has ...
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735 views

Wi-Fi voice calling methods on a jailbroken iPhone? [closed]

I have a jailbroken iPhone 4S on AT&T in Cambridge, MA. My location has unreliable AT&T coverage, and I can't use Verizon or Sprint (too much coverage = pilot pollution). It's got to the point ...
2
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3answers
920 views

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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385 views

My VOIP phone constantly loses service when plugged in via an Edimax router

I have VOIP phone service with Jivetel using a Linksys spa2102 VOIP device. I recently purchased a new Edimax BR-6428ns wireless n router and plugged my linksys device in through it. I made the ...
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439 views

How to configure Transparent IP Address Sharing (TAS) on a Mediatrix 4102 with DGW 2.0 firmware? [closed]

I am making the switch to VoIP. I chose voip.ms as my service provider and Mediatrix 4102 as my ATA. One reason why I chose the Mediatrix over other popular consumer ATAs is that it's supposed to be ...
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149 views

encrypted voip traffic for voip provider that doesn't offer encryption

I currently use a VoIP service with one VoIP provider. However, this company doesn't offer encryption to VoIP traffic. This mean that all voice transmit via my IPphone can be sniffed and listen. (I ...
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167 views

Start call on Cisco Voip phone with an http link

I don't have any previous experience with IP phones. I'd like to know if there is a way to make a call with a Cisco IP Phone (model 7912) clicking just a web link. Actually the phone is connected to ...
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648 views

Hotkey to toggle internet / network communication

I'm looking for a way to quickly toggle my wireless internet connection on and off (to prevent interference with a VOIP device on the network). Newer laptops have a dedicated button for this purpose, ...
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358 views

Setting up a US-landline/Europe-landline voip connection

I need to provide a clients in the US an ability to call a US landline phone, and have the call routed to the mobile phone in europe, where our office is located. I need to have it implemented at a ...
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531 views

Cisco IP Phone to SPA3102 to PSTN

I've just picked up a Cisco 7940G and configured it with SIP firmware (8.2). I'd like to use this as my office phone, communicating with POTS/PSTN via a Linksys SPA 3102 VoIP gateway. In theory, this ...
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170 views

using zfone in practice - how do i force gtalk to use SIP?

Recently i got a need for a fully encrypted and safe communications. Believe it or not - there is no simple solution. Criteria for needed software include: 1. Encrypted 1 to 1 chats (text). 2. ...
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3answers
4k views

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 ...