Session Initiation Protocol is one of the protocols used for controlling sessions (signaling) in internet telephony.

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Plivo SIP problems with NAT traversal

Ok, I've looked and looked, and can't seem to find anyone that's written about this problem. I have a simple office setup where there are two SIP phone extensions (Polycom 331) behind a Sonicwall ...
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1answer
20 views

Can Asterisk accept and send SMS?

Is it possible to send and receive SMS over Asterisk? I am using Asterisk for my communications and it works pretty good. I just wish that I could send SMS to my callers. thanks
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29 views

Installing SIP-4.16.4 and Py3.4-Qt5.3.1-x64 on windows 8.1

I have unpacked sip-4.16.4.zip from riverbankcomputing and ran configure.py from within the sip-4.16.4 directory. In Python34 I now have the folders sipgen and siplib along with sipconfig.py and a ...
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24 views

How to debug “SIP registration failed”?

My SIP phone, which I use from Turkey with a virtual UK number, has recently stopped working with "SIP registration failed" and the supplier of the UK number has told me the times of the last ...
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1answer
86 views

Android won't register SIP on FritzBox router

In the past I've used VoIP/SIP apps to call from my Android phone. Recently I got the upgrade to Android KitKat (4.4.x) and I've noticed that it includes SIP accounts natively (accessible through ...
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41 views

FreeSWITCH simple configuration for audio call between two computers

I have two computers and I want to make audio calls between them. Each one of them is behind a different NAT. I am an absolute beginner and I have no idea what I need to configure. After reading and ...
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0answers
48 views

how to check if a line is pri or sip trunk

I know this is kind of stupid but i have to clear my doubts. I have 2 port digium card and lines for each port with 30 channels each .One line is pri and other for sip .Both lines channels are ...
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8 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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98 views

Sort out - kamailio rtpproxy-ng and mediaproxy-ng configurations

I have been trying to setup Kamailio for calling between webrtc and classic sip phones. I have been able to setup websockets module and webrtc to webrtc calls are working fine (though chrome to firfox ...
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65 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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1answer
30 views

tcpdump prints nothing while trying to listen communication with sip server

The following command sudo tcpdump -nqt -s 0 -A -i eth0 port 5060 works and prints incoming SIP messages. Now I want to see entire communication and entering the IP address of the SIP server: ...
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10 views

Can I initiate call or some communication with sip gateway from fs_cli?

Is it possible to check SIP gateway operation from within fs_cli, whithout dealing with dialplans etc? May be it is possible to "ping" it somehow or something?
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16 views

Calling from sip to dadhi channel

My question is that is it possible to call from sip to dahdi channels ? I have a dialplan which takes and forward calls from PSTN use dahdi channels If i download xlite ,configure my sip.conf and call ...
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141 views

SIP - Python3 - compilation fails on windows 7

Trying to install PyQt5 on windows 7 family premium 64 bits , I have to compiled SIP first. My python version is 3.2 ocated at C:\python32 , %PATH% includes this path I m' using mingw32 make located ...
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46 views

RTP over HTTP with FreeSwitch

is there any way how I can tunnel RTP streams to flow through HTTP ports so it will most probably went through firewalls? I am using FreeSwitch as SIP gateway and I have wss on https port - now I ...
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1answer
1k views

Failed to make SIP calls (Asterisk + PhonerLite + Zoiper + Blink)

I've installed Asterisk PBX on a VirtualBox virtual machine, then created 3 phone extensions: 101 - PhonerLite, 102 - Zoiper, 103 - Blink all of them are configured as "friends". All the clients ...
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1answer
76 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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2answers
100 views

What is SIP, in plain English? [closed]

I have tried reading the Wikipedia page for SIP but I can't follow at all (incidentally, it is currently marked as too technical). What exactly is SIP? I understand how it is a protocol for ...
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1answer
64 views

How to create a proxy to access sip which is IP locked

Here is what i want to do , I have a sip phone configured on my home system which only works on my static IP , Using zoiper soft phone. I want to be able to connect to my system remotely and be able ...
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2answers
94 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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59 views

Can't run sylkserver from AG project

I just installed Sylkserver like this instruction. http://sylkserver.com/download.phtml I use apt-get to install everything and also use default config file. When I use sudo /etc/init.d/sylkserver ...
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105 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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3answers
940 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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63 views

Asterisk Configuration on wireless network

I have installed Asterisk in my laptop on Ubuntu. Afterwards I created wireless network on the same machine (on which I have installed Asterisk). Next I installed 3CX softphone client on two laptops ...
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1answer
448 views

Traffic Route mismatch with two NIC Windows Server 2008

I have small issue on my network I have two NIC, NIC 1 Connected to the internet and local network, NIC 2 Connected to Sip Trunk Circuit (No Internet) Each one of them has different Gateway. My ...
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1answer
166 views

Windows based Virtual Modem software

I am trying to find a virtual software that will allow multiple users to "dial in" to a machine at any given time. However my efforts have been stopped at every step of the way. The phone number we ...
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716 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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2answers
376 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
172 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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2answers
6k 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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1answer
181 views

How to Implement a VoIP Auto (speech) Dialler

Can anyone suggest/recommend a way to implement a speech dialler using a SIP VoIP service? The software/VoIP equivalent of this I want to dial out and play a pre-recorded message as part of an alarm ...
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1answer
212 views

Cisco SPA112 ATA Only Rings Half the Time

I have a Cisco SPA112 ATA Unit which I have set up to connect to an online SIP account (no LAN Asterisk servers in use) and I have this issue where sometimes the unit will not ring when someone calls ...
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436 views

SIP plugin for Trillian

I like using Trillian for chats (Skype, Google Talk, ...) but I cannot add a SIP Account to make calls with Trillian directly. Google always tells me to download the SIP Plugin for Trillian, but this ...
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233 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 ...
2
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0answers
249 views

Zentyal/Ubuntu SIP module doesn't stay unloaded

We are using Zentyal 3.1 (Ubuntu 12.04.2 LTS - kernel version: 3.2.0.38-generic) as proxy/firewall for our location. At the moment the firewall rules are set to allow all, however sip packets are ...
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1answer
525 views

MIxing RFC1918 NATed and public IP addresses using IPTABLES

I wish to host a SIP server and DNS at the end of an ADSL2 connection. My current network sits behind an iptables firewall which runs on a Linux box with two Ethernet interfaces, the WAN interface ...
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1answer
593 views

What does it mean to 'unlock' a VOIP adapter?

I'm thinking about buying VOIP adapter for home use. I already use SIP software on my PC and Mobile, but i think it would be easier to just pick up the phone at any time and call. And I could recycle ...
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1answer
109 views

Consumer Router/Firewall qualities which are compatible with IP phones

I use a SIP phone from home over an internet connection to connect to a PBX in the internet. The internet connection is 50 Mbps down / 10 Mpbs up. Empirically I have tested several routers and found ...
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1answer
198 views

How to set domain if differ from SIP server?

I have server name differs from SIP account's domain name (in SIP the domain name is just a user group and may not coincide with DNS name). I see no "domain" field in Jitsi account configuration. ...
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0answers
345 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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1answer
486 views

Cisco IP Phone to SPA3102 to PSTN

I've just picked up a Cisco 7940G and configured it with SIP firmware (8.2). I'd like to use this as my office phone, communicating with POTS/PSTN via a Linksys SPA 3102 VoIP gateway. In theory, this ...
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1answer
493 views

Two VoIP connections on a single DSL service

I want to connect two SIP phones to my router, alongside one another. One connects to my commercial VoIP service provided by my ISP. The other connects to my business VoIP PBX as a remote extension. ...
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1answer
719 views

Do many of the betamax voip services allow caller id spoofing? [closed]

There are many betamax voip services such as voipgain, voipcheap, voipstunt which ask you to supply a phone number and a destination phone number when making a call (as can be seen in the free trial ...
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1answer
732 views

sip trunking- asterisk(as a sip server) configuration

I would like to create a voip between two clients. I have two asterisks installed and configured on two public ip: Asterisk1 and Asterisk2. I have two clients defined in asterisk1 (client1,client2) ...
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2answers
4k views

What is the difference between a VoIP phone and a SIP phone? [closed]

I was under the impression that SIP is a protocol for the initiation of communication between applications, and that the protocol VoIP is for the transmission over an established pair of IP addresses ...
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2answers
791 views

How to set up a home SIP Server/Proxy for multi ring?

I have a sip account which only allows one device to be registered. When i'm at home I want incoming calls to be able to ring on multiple devices. All of these devices are connected to the local ...
2
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1answer
487 views

What are the internal workings of Google Voice?

I am new to Google Voice and am interested in how it works internally so I have few doubts about it. Is the Google Voice number itself a SIP number? How does Google Voice receive calls from any PSTN ...
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2answers
208 views

Re-registering a hardphone [closed]

I've got a Linksys SPA942 hardphone connected to an OpenSIPS quasi-PBX. I want to re-register the phone manually, without rebooting, resetting, or touching the default re-registering time (3600s) Is ...
2
votes
1answer
55 views

Book for understanding Internet Telephony?

I'm a developer, system/network administrator, and I'm very familiar in setting up internet services such as Apache, BIND, SSH, etc. but what I'm entirely new to is telephony. Is there a book or guide ...
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1answer
127 views

SIP - linksys and no voice

I have a PC and a Linksys SPA3102. I have connected them directly with an etthernet cable (pc address 192.168.0.10, linksys address 192.168.0.1). An analog phone device is connected to linksys ...