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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“Caller rejected because extension not found” in asterisk

I'm an asterisk newbie and I've just installed it on my ubuntu 12.04 server with sudo apt-get install asterisk. I'm following the tutorial for asterisk from here: ...
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1answer
345 views

FreePBX Calls connect but no voice

I have FreePBX running on virtualbox on a windows 8 host the network adapter is set to bridged and I have assigned it a static IP address. My windows 8 host is connected to a typical home wireless ...
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97 views

How do I setup a Yealink phone over internet connection sharing?

The physical configuration is as follows: Computer accesses the internet over 'Wireless Network Connection' Yealink Phone is connected to the Computer over 'Local Area Connection' Here are the ...
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105 views

How to use SIP soft phones to test concurrent calls?

I don't know anything about softphones, VOIP, SIP, etc, but I want to setup a development computer to dial into a SIP server (twilio app) with concurrent calls, using some kind of softphone software. ...
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1answer
47 views

Disabling saying extensions when the ext is not available with Asterisk?

I setup Asterisk and everything works great. The main issue I have is that when the external call cannot reach the default extension, the system repeats the extension number which could be desirable ...
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1answer
380 views

What are “Difference” and “Delta” in Wireshark RTP Analysis?

I tried to find this in the documentation, but had no luck. I would love to dig the sources to find out, but I honestly don't have the time. I tried to google this, but either people do not get any ...
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0answers
371 views

How to call an extension directly from outside with Asterisk?

How can I call an extension from outside directly without using a voice menu? For example I am calling a number xxx-xxxxxxx and the extension is 2002. I have not setup an voicemenu type thing with ...
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3answers
938 views

Why can't SSH tunneling be used for SIP VOIP encryption?

On http://www.voip-info.org/wiki/index.php?page_id=2716 it says "Note that SSH tunneling is not a viable method for VoIP media path encryption." Why can't SSH tunneling (as opposed to a VPN) be used ...
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418 views

Best way to block users from connecting to VOIP (Teamspeak)

In a teamspeak that I work with, we've banned users from comming back and they just change their IP and come back on. We've been searching for a way to keep them out even if they change their IP. Do ...
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174 views

Passing through TOS/DSCP through two layers of OpenVPN, possible?

About a week ago I posted about a problem I am having getting usable VoIP connections working on a machine configured using mirimir's dual-VPN isolation system. (For details on the setup see my ...
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1answer
192 views

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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16 views

setting up phone recording system

I would like to have a system (either hosted on our own computer or provided by some sort of service) where we can receive calls to a virtual phone number and allow users to record messages (sort of ...
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1answer
956 views

How can I manage bandwidth consumption of GoToMeeting?

Gotomeeting sessions hog all my networks bandwidth... I have business class cable and other video/audio apps (e.g. Skype, Google Hangouts or Webex) work properly. In a session yesterday, I initially ...
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1answer
163 views

How to improve VoIP quality using my home Wi-Fi?

I'm using a VoIP service on my Android, and it's working great from the office, and even over 3G/4G, as I have purchased the g.729 codec. However, when I'm home, my 3G switches to home wifi, and I ...
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1answer
220 views

Muting audio when receiving a VOIP call - which software is compatible? [closed]

Windows is able to reduce/mute other audio when it detects communications activity. What VOIP softphone is compatible with this? I will have a USB headset and will listen to music and would like it ...
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714 views

Android SIP / VoIP with doorbell: View video before answering

I am currently using the 2N Helios IP Vario doorbell device. It can be used via SIP protocol, but can also communicate with the 2N Android app directly, without an additional server, which I would ...
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434 views

Android and Windows (or Linux) software for simple P2P VoIP

I'm looking for a simple way to set up a VoIP connection between an Android phone and a Windows or Linux computer. I've been looking at Asterisk and other SIP servers, but a) they seem primarily ...
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1answer
202 views

How do I write a bash script that makes a phone call on my cell once a matlab process finishes?

If not a call, is sending a text message possible? I have tried setting up an email notification and that worked, but I would prefer if I got a call or a message.
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1answer
130 views

Asterisk replacement for multi-line/multi-phone/all ring Nortel system?

I'm trying to replace an aging Nortel phone system with an Asterisk based system. The existing system work something like this: Phone 1- -Line 1 Phone 2-- --Line 2 Phone ...
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1answer
575 views

How to avoid a skype block by internet provider

Maybe this question could look a bit dodgy: I'm in the need of using Skype for an online meeting. However I've discovered that starting from this year my IP won't allow Skype connections anymore ...
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1answer
98 views

Make your PC (Software to use?) as a phone with a router with a VOIP capabilities

I have a modem TD- VG3631. It has a VOIP on it. I can connect my phone to use VOIP.. But How can I use my pc as a phone because my pc already has a mic, speaker and a cam. Is that even possible? My OS ...
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26 views

UDP tunnel over SSH : almost? [duplicate]

I am trying to set up a UDP tunnel over SSH but it doesn't work. Machine A is under Windows Machine B is running Linux I want to connect (voice over IP) from machine A to machine B via UDP with ...
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2answers
375 views

How do I make a SIP call from behind an HTTP Proxy?

We browse websites using an HTTP proxy; there's no direct internet access. The only VoIP program that works out-of-the-box in our network is Skype and it's using that proxy too. For example, I want to ...
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0answers
171 views

pfSense allowing inbound sip phones, but not sip trunk

I am currently trying to get an inbound trunk working on a remote Asterisk machine. The ip phones are remote and connecting just fine through port 5060 (I can make internal calls to voicemail, other ...
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1answer
78 views

How do I keep my file transfers from sucking up all my bandwidth?

How do I set up a router so that my file transfers have 2nd priority? My VOIP and GoToMeetings suffer if we are transferring large files from our internal network to a hosted server. 70 gig backup ...
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1answer
253 views

How to I setup a VoIP Server (not connected to telephony)

What I need is a VoIP server that allows people use their data bundle to make calls within an app (mobile/PC), but not necessarily app to phone but App to App. That means, both users have the app ...
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1answer
294 views

Google Voice vs Pinger for PC (Windows 7) [closed]

I have a buddy who is going through a very rough time financially. He currently does not have a phone but does have a laptop with wifi access. I have been looking for a way to help him get a free or ...
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0answers
98 views

automated text to speech phone call from ubuntu server to deliver one time confirmation code

Basically, I want to implement the same type of system Google and other sites use to take someone's phone number, and call the number from the ubuntu server with an automated voice that presents them ...
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2answers
6k views

Which one VoIP SIP audio codec should I choose to high quality calls?

The quality of VoIP calls depends on the codec used for the transmission and on the bandwidth of Internet connection. I want to use best optimized codec for my Internet connection. I have to select ...
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1answer
201 views

virtual pbx using x-lite stuck at offline

I am using x-lite to connect to virtualpbx.net. One of my user's x-lite is stuck at offline and the availability dropdown box is grayed out. I don't see any error messages in x-lite or virtualpbx.net. ...
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635 views

Yum hangs on setting up package sacks

I'm having trouble with Yum installing postfix. I'm using yum on a trixbox/freepbx system and trying to get voicemail-to-email setup for VOIP Cisco phones in an office environment. Anyways I try ...
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1answer
181 views

How to Implement a VoIP Auto (speech) Dialler

Can anyone suggest/recommend a way to implement a speech dialler using a SIP VoIP service? The software/VoIP equivalent of this I want to dial out and play a pre-recorded message as part of an alarm ...
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Secure PC-to-PC voice call without going through a server [closed]

I want to voice-chat to a friend over the Internet. (Video would be a nice bonus.) I want the conversation to be private and I do not trust Skype, Google, etc., so I want it encrypted end-to-end. ...
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1answer
212 views

Cisco SPA112 ATA Only Rings Half the Time

I have a Cisco SPA112 ATA Unit which I have set up to connect to an online SIP account (no LAN Asterisk servers in use) and I have this issue where sometimes the unit will not ring when someone calls ...
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343 views

Cross-platform, decentralized (or available server daemon) IM/VoIP that's easy to use and actually works? [closed]

Given recent revelations about constant dragnet surveillance, I've decided to start looking for alternative forms of communication that let me be in control end-to-end. My first step is to wean ...
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1answer
65 views

Sending keyboard presses to minimized rdp windows

Is there a way to send key presses to a minimized rdp window? For example: If I was rdping to another computer that had a voip program that uses a push-to-talk key (for example, mumble) is there any ...
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48 views

How can I blacklist a program from accessing a mic or volume controls?

In this particular case, I have a program that ignores settings for mic usage (eg, it always-transmits even when its own push-to-talk and such is set, and causes all other program's volume to be ...
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2answers
833 views

Realms in Asterisk

How can a system (Asterisk) accept realms? I mean, for example we have two SIP accounts: exampleuser@test.com and exampleuser@anothertest.com. For Asterisk by default, these two accounts are the same ...
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232 views

Firefox can't find the file at sip: xxxx

Hi have a voip service that works great and use Bria Counterpath softphone - also good. I have installed a click to call add on for Firefox and keep getting this error: Firefox can't find the file ...
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1answer
500 views

Wake on LAN/VoIP for Skype use?

I'm surprised I can't find this anywhere, but is it possible to have a sleeping PC wake up when a Skype call comes in? If so, how to set it up? Using XP.
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706 views

Converting G.722 audio files using ffmpeg

I have a G.722 RTP stream that was captured with Wireshark, and am trying to convert it to PCM using ffmpeg. I have done similar things with other codecs (like G.729), and the conversion works ...
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1answer
111 views

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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1answer
231 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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3answers
361 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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2answers
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
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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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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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575 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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289 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 ...