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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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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18 views

School Bell with Digium Switchvox

Wondering if anyone has a script or suggestion on how to setup a School Bell with VoiP phones. Basically I'd like to setup a schedule to call every phone in a group, switch to speaker, and play a ...
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58 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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39 views

Any way to hook up Google Talk with a FreeSWITCH server to make outbound phone calls?

Once, with Google Voice used XMPP, you could use it to do free outbound US and Canada calls with your Asterisk or FreeSWITCH server. Today, if you use this guide, ...
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41 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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48 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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1answer
90 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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76 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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37 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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1answer
12 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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45 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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3answers
749 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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1answer
115 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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194 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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76 views

3CX integration with SQL server database

I am planning to buy 3CX for my company. I have my own call center software which is used to enter the details about caller. When our customer care executive enters the caller number in the grid, ...
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124 views

FreePBX, no IP Phone connected: queue not calling external numbers

I run asterisk/FreePBX installed with the FreePBX distro on a dedicated server. There is Queue for incoming calls with 2 static agents: extension 01 and 02. Each static agent has a VoIP phone ...
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2answers
980 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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90 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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60 views

Polycom IP 501 - No web interface?

Just my luck. I ordered a polycom IP 501 phone off the internet and can't get it to connect to my voip service (yes, my settings are correct). So I try to go to the web interface and get a 404 - page ...
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2answers
43 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
84 views

Difference between VOIP and IP Telephony

I am studying CCNA, and in the curriculum I found something like following... ↓↓↓ VoIP When introducing VoIP to a network that uses traditional telephones, it is important to remember that ...
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283 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
64 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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67 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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2k 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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215 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

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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81 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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39 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
184 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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212 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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618 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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231 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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120 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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148 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
621 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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119 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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156 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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289 views

FreeSwitch - how to configure ICE, Turn, Stun, NAT traverse mode?

I have been using FreeSWITCH but some of my test users are behind very complicated network. Where default FreeSWITCH setup is not working such as: they can't register via SIP and also there are audio ...
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558 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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331 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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97 views

how to connect analog devices on Cisco CallManager

I have to migrate an office into our Cisco CallManager. The analog phones will be replaced by Cisco phones. But I have to connect thee Fax-Lines and two conference telephones which are all analog. In ...
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1answer
170 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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109 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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103 views

Is there a way to use the FXS (phone port) on AT&T's Uverse modem/routers with my own voip service?

I have an AT&T uverse modem/router, the motorola nvg510. It has a built in FXS port for VoIP. I'd think there would be a way to use this with a sip/voip provider of my own choosing, but I don't ...
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26 views

Call connects through Emapthy, but no voice

I am trying to make calls using Empathy on Debian.The call rings and connects, but I can't hear voice, or answering machines. I had a similar problem a while back that was caused by my PBX not being ...
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1answer
337 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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82 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 ...