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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Where or how do I register a new phone number intended to be used with voip? [closed]

Ok I'm not sure if this is the right place to ask. Goal: Have a voicemailbox with multiple phone numbers. 1 in each continent. Example: +1123456 -> voicemailbox +49123456 -> voicemailbox The scope ...
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17 views

Make a SIP address call

I have a Polycom Deskphone (model 321) that uses SIP/VOIP to make calls etc via my provider. Calling normal numbers works fine as they are then translated by my provider & routed accordingly to ...
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229 views

How to break Lync / Cisco IP Softphone interaction when placing a call from Lync?

I have the following VoIP configuration on my Windows 8.1: a Lync 2013 client (connected to an OCS server) Cisco IP Phone (for PSTN calls) a speakerphone (speaker & microphone, namely a Jabra ...
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156 views

How configure 2 Lan cards in Windows 7/8 pc one to connect to Internet and other to Local Network

    I am about to install a dedicated VOIP server in our office. It is a 3CX pbx system on Windows 7/8 machine. The environment currently is a Windows SBS 2011 with 8 client machines. I want ...
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2k views

Voip phones losing registration from external SIP PBX

This has been a pain. My polycom voip phones (about 10 of them) are all losing registration every few hours. Each time I check them, some will be registered and some will not. Rebooting my firewall ...
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137 views

Why a DNS server on an ATA?

I was portscanning this home network from the outside and found three open ports: telnet(!), http and domain. I quickly realized that those ports were belonging to an Eltek R7121-L1 ATA that is ...
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189 views

Creating an outbound call center software in asterisk [closed]

I an outbound call centre as i know the server calls a person and connect the call to the executive.Executive via headphone attached to a system directly talk to the person means there is only one ...
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413 views

Asterisk server firewall script allows 2-way audio from incoming calls, but not on outgoing?

I'm running an Asterisk PBX on a virtual machine directly connected to the Internet and I really want to prevent script kiddies, l33t h4x0rz and actual hackers access to my server. The basic way I ...
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256 views

Identifier 2, identifier_type 2 not found in identifier list

I am using asterisk 11.9.0 and created a dialplan.My problem is that everytiime i perform an sql operation its working fine but the line same => n,mysql(clear ${resultid}) is giving a error ...
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60 views

Why use a PCI System Timer?

I have heard it said that servers serving VOIP services such as Asterisk should use a PCI System Timer. Why? Nowhere is this ever explained, and googling reveals no clear use-cases for the device. ...
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15 views

Can you automate change of settings for all phones?

Is it possible to automate the process of changing some settings for VOIP phones running on Asterisk PBX? i.e. I have 10 phones connecting to PBX at all time. 5 of those phones are at one customer ...
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125 views

Why isn't my router allowing my PAP2T to connect to my VoIP service?

My tech knowledge is middle-low: as you can see I'm not shy about getting into the interfaces for my router, but have no idea what the more complex settings mean. I got a new wireless router (D-Link ...
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20 views

Using an existing telephone system with Skype home service [duplicate]

I'm interested in migrating my current telco-based phone service to a more affordable VOIP solution. Because of this, I've decided to settle on Skype, which I've used for years and has been my choice ...
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2k views

Skype shows I'm online when I don't have any Skype instance running

Recently Skype shows me as online to my contacts even when I do not have any instance of Skype running on my desktop I signed out of Skype on my mobile Apparently, this is a feature not a bug. ...
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287 views

Why my outgoing VoIP calls are sometimes that bad?

I have a Cisco SPA122 ATA Router in Bridge mode where I connect my analog phone. Turns out that usually on incoming calls, I don't have any issues: connection goes smoothly, the caller hears me ...
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413 views

Websockets on Kamailio + sipml5 + rtpproxy-ng + jitsi

I need quick help with pointing direction on what I should look at - I got Jitsi with Kamailio up and working both signaling and RTP streaming now I got Kamailio with ws:// setuped and sipml5 working ...
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3answers
5k views

Skype cutting out and skipping my voice

In Skype calls, sooner or later my voice starts cutting in and out; mid sentence my voice will go silent for several seconds, with no quality loss outside of the cut out. Sometimes instead my voice ...
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148 views

Stream windows audio over network and send back mic sound

I am a little lost as to how I go about implementing this kind of setup... We use SIP Softphones in our office, I would like to be able to, from another computer on the network, listen into the call ...
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3answers
149 views

Does DSL/VOIP Service Work In A Power Outage

Just curious, but does DSL service work in a power outage? From what I know, DSL uses regular phone lines to transmit digital rather than analog signals at a higher speed, and regular phone service ...
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2answers
322 views

Difference between VOIP and IP Telephony

I am studying CCNA, and in the curriculum I found something like following... โ†“โ†“โ†“ VoIP When introducing VoIP to a network that uses traditional telephones, it is important to remember that ...
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693 views

Router using different ip address when modem is in bridged mode

I have a zyxel modem/router that is blocking my voip, and so I want to put it into bridge mode. When in bridge mode, I use my own router, and my voip works fine. We have 5 static ip addresses at our ...
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2answers
417 views

What happens when two SIP clients log in at the same time

If two SIP clients are logged in to a service provider at the same, what happens when an inbound call comes and what happens if you try to make an outbound call? (This question is regarding SIP ...
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145 views

The Risk of Port Forwarding to a VOIP Device

My VOIP provider uses a device to supply the service. The device is on my side of my router and part of my LAN. He requires I forward a very large range of ports to his device (something like 5000 ...
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8k views

“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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470 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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62 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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737 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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515 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
2k 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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930 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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273 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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2k 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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251 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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348 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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950 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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596 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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284 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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171 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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749 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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138 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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29 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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770 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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232 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
79 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
398 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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439 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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141 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
10k 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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316 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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890 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 ...