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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A good softphone for OS X

I'm sorting out a VOIP setup for the office that I work in (there's about 50 people, mostly macs), and I'm looking for a good SIP softphone that would work with an Asterisk based PBX, and I figured ...
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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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146 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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934 views

Garbled VoIP over VPN, mainly on conference bridges

My office has a large Cisco UCM setup, and I work primarily remotely with a physical Cisco 7940 phone. I've battled some quality issues before, which turned out to be a bad switch port. But mostly ...
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56 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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98 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
204 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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1answer
478 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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114 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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1answer
934 views

Is it possible to run Skype on my NAS or DD-WRT?

Ok so here is my setup: Qnap NAS > TS-210 Gigabit router/switch with DD-WRT (big-generic) multiple PC's 1 usb-to-phone box > Trust ST-1200 Internet Phone Station (this is pretty old...) 1 phone ...
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293 views

Skype call recording with real-time annotation / markers?

There are plenty of applications to record Skype calls, but I am looking for one that allows you to place "chapter markers" or any sort of bookmarks or annotations at certain points in the call in ...
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30 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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1k views

getting pbxes, sip2sip, ipkall all working

I was able to make a call from my landline to my ipkall number and have it ring on my android device running sipdroid. Just once. Since then, when I call my ipkall number, I get "The person at ...
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263 views

Good quality audio conferencing without a headset

I work at home and am doing a lot more video conferencing than I used to. I also use a softphone on the computer for most of my phone calls as well. Particularly when video conferencing I would like ...
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31 views

Videoconferencing software that degrades framerate rather then resolution

Is there a video-conferencing software that can be set to degrade framerate rather then resolution when the intervening connection is slow? I do a significant amount of remote collaborative work. ...
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88 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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228 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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129 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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47 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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483 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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175 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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157 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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160 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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606 views

Using Asterisk with multiple phone lines (PSTN)

I've had experience working with Asterisk over VoIP. Did pretty complex stuff with it as long as it had ethernet cables and internet connected. I've gotten used to connecting the box to an ITSP and ...
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339 views

Voice activated and silence deactivated audio recording software

I plugged my PBX into the microphone hole in my PC's sound card, in order to record all activity on my PBX in MP3 format. I am using the software called "Recordpad", by NCH. The problem is the ...
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17 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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38 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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74 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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121 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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57 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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61 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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210 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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113 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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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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118 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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282 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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551 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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328 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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96 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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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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207 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
85 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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427 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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178 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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595 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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325 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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142 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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719 views

How to Change SIP default port 5060

Port 5060 is blocked in our network, and I was wondering if it was possible to change it to 5222, which is a port used by Google Talk. If it is possible and I do change it, will I still be able to use ...