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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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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72 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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29 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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15 views

Why won't Bria join a conference call?

I'm using Bria softphone to connect to a Mitel phonesystem and am unable to join conference calls. I dial the conference number and get a "Failed to establish call" error. Note that I am able to ...
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13 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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20 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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15 views

My Google Voice stopped forwarding voicemail to email when I changed my t-mobile phone [migrated]

I've been forwarding my t-mobile voice mails to email for years now. I don't even remember any more what I did to set it up! Then I dropped my phone, and temporarily got a really old Android phone. ...
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78 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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23 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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21 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
26 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
30 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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47 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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32 views

Fast new service with Zyxel modem blocks my obi202, worked fine on old dsl

Ok, so this is an unusual one. We have a business account and use a Zyxel zyxel p-873hnup-51b modem for our service. This service bonds two dsl lines together to give us a 20/2mbit line (vs our old ...
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20 views

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

If two SIP clients log 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 service ...
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1answer
38 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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1answer
437 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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1answer
71 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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34 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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45 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
26 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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76 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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80 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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2answers
219 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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70 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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45 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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87 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
273 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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74 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
82 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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168 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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397 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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236 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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54 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
114 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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86 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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62 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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22 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
142 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
67 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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20 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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108 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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106 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
66 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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votes
1answer
101 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
143 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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63 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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1answer
2k 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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93 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. ...