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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SIP ALG detector

I am trying to create a detector for SIP ALG. I really just need to know what the BEST method of testing this is so I can write a program to test whether SIP ALG is enabled or disabled. Thanks
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22 views

How to properly setup a VoIP client with VPN?

We want to use Zoiper VoIP client with TotalVPN but seems like they are not playing nice together. Zoiper accounts are going off the moment we turn on TotalVPN. Any suggestions?
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14 views

Billing for inbound calls using A2billing and Asterisk

I have installed A2billing and integrated it with Asterisk, Is there a way to test A2billing for inbound calls ( I mean asterisk to asterisk or local users)? I just want to add define rates for ...
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1answer
49 views

Does Skype use only Ipv4 or also IPv6?

A simple question. Does Skype use IP version 6? If yes, how can i set it to use this type of addresses? Are there other VOIP application using IP version 6 (like VIBER or Whatsapp)? Thanks
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1answer
3k 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
12k 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: https://wiki.asterisk.org/wiki/...
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1answer
1k views

Asterisk PBX - Transfer nuisance calls to special extension

I'm using asterisk 1.8.14 and freepbx 2.10. I keep getting telemarketing calls and want to do the following when they call. Have a special extension number I can manually transfer the calls to The ...
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34 views

Block Whatsapp Voice Calling

We are using Whatsapp (Android) to communicate with our customers and would like to block only the Voice Calling (VOIP) feature on the app since we route all voice calls through our PBX. I do not ...
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3answers
5k views

How to connect a remote IP Phone to our VOIP Network?

We have an IP phone system in our office, and about 8 VoIP phones running on the system. We have a remote worker, who is literally states away. We'd like to connect his phone to our VoIP network, so ...
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3answers
57 views

how do I provision a hard phone for getonsip?

In provisioning a Cisco SPA 942 hardphone, branded Linksys, how do I finish the setup for getonsip (or onsip)? SIP Address: foo@getonsip.com Username: foo Domain: getonsip.com SIP Password: ...
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22 views

SIP with Huawei LTE cube E5180

I have recently obtained a Huawei LTE cube E5180 for connecting my home WLAN to the Internet. As a newby to SIP I have also noticed that the LTE cube comes with some SIP support. It allows the ...
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23 views

How do I troubleshoot a Cisco IP phone with no sound? [closed]

In provisioning the Linksys branded Cisco IP phone described below I think there's an error with regards to the dialplan in the hard phone, or perhaps ports, preventing sound. Admittedly, I have no ...
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25 views

How is a SIP invite sent?

The telnyx Data API tab describes a SIP request: Requires IP Authentication to be setup through the portal and associated with LRN under Telephone Data Tab Send a SIP Invite to lrnlookup....
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12 views

WatchGuard SNMP Traffic Accounting vs ISP Accounting

Our Setup I currently have a WatchGuard XTM 2 Series running as our firewall. There are two Internet connection lines: one EFM line for data traffic and a high-speed ADSL line for VoIP traffic. The ...
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5answers
45k views

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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18 views

SIP server name Defaults to $VERSION for Cisco SPA 942 hard phone

In reading the fine manual for a Cisco SPA 942 IP phone, branded as Linksys: what is, in particular, meant by: SIP Server Name Server header used in responses to inbound responses. Defaults to $...
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2answers
1k views

Not able to answer call

Got a Cisco Sipura SPA 941 hardware phone and I am connected to Asterix (most likely) VoIP server of my provider. I am behind a firewall (ADSL) and I have put my phone to the DMZ zone, so it should ...
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4answers
4k views

SIP client to open a web page with caller ID

Does anyone know of a SIP client that can open a web page to a configurable URL when someone calls? We have a web-based database, and I'd like to search by phone number whenever we get an incoming ...
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1answer
469 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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2answers
1k views

How do i run asterisk behind an VPN?

I am new to asterisk, so basically i know nothing about IP PBX. I need to start the a VPN server with behind it asterisk and my clients should be able to connect with softphone with build-in VPN ...
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1answer
49 views

How to make international phone calls from my computer' through my SIP server?

I'm currently working for a scientific company, and I'm the only programmer here, and the company wants me to use one of their servers to setup a SIP server, and somehow be able to make calls to ...
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31 views

Recovering Google Hangouts call history

When a user changes their Google account password, they are automatically logged out of Google Hangouts on any and all Android devices. This has the unexpected consequence of deleting all their call ...
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58 views

Linksys SPA3102: receive PSTN calls on sipphone, route outgoing calls to voip provider

I'm having problems to configure my Linksys SPA3102 according to my needs. I have a sipdiscount.com account, a PSTN line, a SPA3102 router (just bought it) and a sip phone. Until now I used my sip ...
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3answers
597 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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1answer
60 views

New modem/router doesn't allow VoIP going through

Before I bought my new Netgear D7800, I had a Fritzbox 7490 provided by my swiss ISP Sunrise (see image case A). It does all tasks : modem, router, connects landline phone to be used as IP phone. ...
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1answer
75 views

No fax detected with HP MFP

I'm trying to set up a HP LaserJet MFP (multifunction fax printer) M476dw as a fax machine. It's connected to a Linksys PAP2T analogue telephone adapter (ATA) with VoipVoip as service provider with a ...
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1answer
40 views

VoIP adapter for doorbell [closed]

At Network Engineering I was told that my question was off-topic there, but that I could ask it here, so here it goes... I hope that it is on-topic. Current situation At home I have a Siemens TFE/V ...
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1answer
21 views

SIP forwarding via DNS. Possible?

Let's say I have an address sip:john.doe@example.com that I would like to use for Internet calls, but my SIP provider is Callcentric and I need to route such calls to sip:17775551234@callcentric.com. ...
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1answer
63 views

Cannot see VOIP calls in Wireshark 2.0.0

I received a pcap dump from a site, running Cisco JTAPI, who's VOIP traffic I need to analyse. I use Wireshark's VOIP calls analyser via the menu: The conversations display fine in Wireshark v1.10....
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5answers
180 views

ISP blocking VoIP - Morocco

Moroccan ISP's have blocked VOIP services since yesterday.. and we are looking for a way to counter it, even if we have to use a paid service. We'd like to get around this block - Could I use a paid ...
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1answer
35 views

Home structured cabling - which cables?

I've recently purchased a 25U rack with some networking for my home. I'm about to order some Cat6, but I wanted to ask a few questions: I noticed that some people have video cabling in their homes. ...
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15 views

AT&T DSL causing static on VOIP line

We recently changed from Comcast internet to AT&T DSL. Since then we're having static on our phone line, which is a Vonage VOIP line. I'm assuming I need a filter, but I'm not sure where to put it ...
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2answers
1k views

Sipura / Linksys / Cisco SPA3102 problems with analogue phone

I have bought 2 of these SPA3102 - One direct from china(verified original) and one from Ebuyer UK but it is called SPA3102 -UK I find this guide and followed it I am only going to talk about the ...
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1answer
51 views

Does Ventrilo encrypt the VoIP stream, session, and/or communications?

If you're not familiar, Ventrilo is a voice chatroom used for gaming. Here's the wiki for Ventrilo and similar software Mumble and TeamSpeak to give you an idea of what the software is about. I ...
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1answer
63 views

Home network - do I need QoS?

I'm planning to install a home network with the following hardware: Netgear UTM50-100 ProSecure Netgear ProSafe JGS524PE (24 Port switch, 12 Port PoE) ESXi Server w/ 2 VM's (AWS Storage Gateway &...
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58 views

linphone: remove/hide “default identity”

Linphone automatically generates a computer-local SIP identity called "Default Identity". "Real" SIP accounts you have at a VoIP provider need to be created as "Proxy accounts": The main window ...
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3answers
474 views

Jitsi and Telekom Germany - outgoing calls “Call failed - Not Acceptable”

I am trying to configure Jitsi to operate as a softphone for my Telekom Germany VoIP-connection. So, I went to the website of Telekom Germany, which provides the following details for connecting: ...
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1answer
222 views

How to receive incoming calls on landline and mobile phone at the same time [closed]

Current situation a fixed landline for phone just one number: 123-456789 handled by one DECT base station with three phones one mobile (Windows) smartphone with its own mobile number, having wifi, ...
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27 views

Small business VoIP and wireless router [closed]

We recently changed our phone system to Ooma (http://www.ooma.com) but kept our current Internet provider, Time Warner. We have one router in the office and a booster plugged into the hallway wall ...
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1answer
226 views

No audio after SIP reinvite

I am trying to get a Gigaset C470 IP to work on my Internet connection. I have figured out the correct configuration for the device and my router (a pfSense sitting between the DSL modem and the LAN) ...
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26 views

Is it possible to avoid long distance charges with an IP-based phone?

Is it possible to avoid long distance charges with an IP-based phone? I am not talking about client-based VOIP services here (like Skype), I am talking about a REAL IP phone using Asterisk or some ...
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1answer
72 views

ISP blocking 5060

Here is a problem. I move my RasPBX Server (Asterisk for Raspberry Pi) to new apartment and ONLY one ISP in building which is blocking 5060 After few days fighting with Asterisk, I discovered that ...
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1answer
35 views

What is: Keep port forwarding of the Internet router enabled for telephony

When using a fritzbox with attached phones in bridge mode behind another router, manufacturer avm suggests to enable the option Keep port forwarding of the Internet router enabled for telephony, ...
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1answer
18 views

3cx or other IP PBX - can this be done without a paid incoming/outgoing number

I am looking to setup 3cx for family use with a couple android devices. Do I need to buy a SIP trunk if I just want to connect the ony 4 devices to each other? If i do get a line, can I only have 1 ...
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0answers
94 views

How to call other phone in the same house and network

I have an analog phone (Panasonic KX-TS505MX) and it is connected to my modem router (ZTE F660) via POTS. My router modem have 2 POTS slot, my question is if I buy another phone, is it possible to ...
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2answers
35 views

Increasing network range for new VOIP users

Our office using 192.168.1.0 /24 for DHCP 120 users and reserved 20 IP for servers and 10 IP for network printers. Now management decided to upgrade to VOIP phones for all users so I need to make ...
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22 views

Belkin Router OpenWRT Custom iiNet Model

I am trying to install OpenWRT or DD-WRT on an old belkin ADSL/VoIP router/modem. But, because it is a custom model made for iiNet the model number isn't listed anywhere. I have opened up the case ...
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2answers
192 views

Gateway iP address after increasing network to /22

I am using /24 network now but i need to increase to /22 (255.255.252.0) in order to get more space for upcoming VOIP users and mobile users. But all of our servers are configured from 192.168.1.1 to ...
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35 views

Why is my sip software calling 105

I have a very bad sip provider "vbuzzer" but there prices are cheap ,they don't have an app for android (there is one in the store but i am pretty sure it is not official ,and a scam) and their ...
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1answer
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POE phone: ethernet passthrough: is it transparent? [closed]

I have a small sub-net in my office on a Netgear router. We're getting POE phones. If I plug the POE phone into the wall jack for its power and signal, will the phone pass the ethernet data signal ...