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

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I need to spoof the source IP of a packet

I'm running some tests for a security project and here is the scenario. I have a SIP server (SBC) that accepts calls from a list of IP addresses. I have a SIP INVITE packet and I want to send to that ...
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5 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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22 views

Can't add 81.23.228.129 to iptables because of SERVFAIL - any way round this?

I need to allow the IP addresses of proxy.sipthor.net through my firewall: nslookup proxy.sipthor.net Address: 85.17.186.7 Address: 81.23.228.129 Address: 81.23.228.150 Add these to iptables: ...
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7 views

Can't complete opensips 'make menuconfig' on Xubuntu 15.04

I'm trying to compile and install Opensips-2.1.2 (or 1.11.6). I've installed lots of libraries to make it run (especially ncurses). Now when I try to run following command: make menuconfig I get ...
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19 views

I do have a toll free number that i want to use with soft dialer like xlite or eyebeam

I do have a toll free number. I want to use it for my online shop. How can i use it with a dialer like xlite or eyebeam?
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1answer
17 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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0answers
33 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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12 views

SJPhone worked. now says “Service Unavailable”

I have been using SJPhone on Win7 for about a month for testing a SIP service and everything worked flawlessly out of the box. Today I'm getting a popup saying service unavailable when I try to ...
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30 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 ...
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28 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. Untill now I used my sip ...
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1answer
56 views

How to send a SIP message with a batch program

I must be missing something. I can't seem to find how to send an instant message via SIP using a simple batch program to which I can pipe the content of the message. I know how to do it ...
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1answer
90 views

SIP address for groups in Lync

For opening the chat window with Microsoft Lync, we can call either Lync SIP:user@company.com or SIP:user@company.com However I am looking for single command for open a group chat. It ...
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57 views

no sip account work with any application but linphone account work with all, so, what to do?

I want to use sip to call my friends and family so first I installed jitsi on windows7 64-bit laptop then I registered with linphone which work perfectly, but, I want another separate account from ...
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1answer
308 views

Asterisk SIP calls ending after 2 minutes using Twilio's trunking service

I have an Asterisk server hosted on DigitalOcean that is having calls drop after exactly 120 seconds using Twilio's trunking service. It is notable that directly connected softphones do not drop their ...
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1answer
379 views

How to call a PSTN number from a soft SIP Phone through Asterisk

I am getting started with Asterisk. All I want to do is to call a PSTN number from a SIP softphone. I have gone through the latest edition of the book: Asterisk, the Definitive Guide and done the ...
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3answers
270 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
160 views

Make one way SIP video call

Using Asterisk, CSipSimple and MicroSIP I was able to make a video call, but to make it work both parties should click on "video" and video will be transferred in both directions. I do not like this. ...
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46 views

Asterisk server asks peer on other server to Authenticate

I am trying to have an SIP peer on one asterisk server call an SIP peer on another asterisk server. I have SRTP enabled between the two servers not the SIP clients. When I initiate the call, i.e SIP1 ...
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1answer
57 views

Do I need STUN?

My router has a "real" static outer IP address. Behind router's NAT there is an Asterisk server. Router is configured to forward 5060 UDP port to Asterisk machine. Do I need STUN server assuming that ...
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227 views

SIP: The other party can't hear me but I can hear them when using Asterisk

Please read carefully all the question and do not rush to a conclusion. === Test environment for point-to-point calls, without Asterisk === City1: A router with NAT and WiFi and 5060 UDP port ...
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2answers
879 views

Failed to authenticate SIP peer

I am trying to connect an SIP peer using Zoiper to my asterisk server. The peer is a soft-phone on my server. I have the following config for the peer: [201] disallow=all allow=alaw ...
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1answer
42 views

What's Lax and Lax2 protocols?

Are LAX and LAX2 communication protocols like SIP? What are these? Some telephone systems support them beside SIP but I cannot find information on google
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2answers
56 views

Why do Ekiga touchtones only work with the RFC2833 setting?

I have Ekiga acting as a softphone for my VOIP account. I made a call to an automated switchboard which required me to "press 2 to continue". I attempted to press "2" on the keypad pane but the DTMF ...
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2answers
172 views

How to get and install g723 codecs for sip applications?

I install an ubuntu desktop in my company network (windows network) that use SIP on software phone and hard SIP phones. I use Jitsi that is a good client for SIP and works well with others software ...
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52 views

Interactively play sound clips in VoIP call

I'm looking for a solution to digitally mix sound clips in a SIP or IAX VoIP conversation. Ideally I want a solution on Linux platform. My end game is to have a sound board to play funny clips while ...
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1answer
122 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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17 views

VoipMonitor - how to limit number of MOS calculations

VoipMonitor begins to calculate a given call's MOS score right after the call ends. If there are many calls that drop at the same time, VoipMonitor will spin up many threads to calculate the MOS ...
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54 views

IPTables and SIP Proxy-Authorization Header

Is it possible for iptables to check SIP packets for Proxy-Authorization headers, and if there's more than one header in a SIP packet, modify the packet so only the latest Proxy-Authorization header ...
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88 views

set Cisco SPI firewall to high, but allow SIP traffic?

How can I set the SPI firewall settings to "high" for the router, and yet allow SIP traffic? If I set the firewall to medium, the call will connect but I don't hear anything.
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49 views

Ekiga softphone shows as “registered” — but is it actually?

Is Ekiga actually registered? How would I know? I think Ekiga connects, or at least it says "registered": But, when I exit Ekiga, and use SFLphone, it fails to register: While sipsak shows a ...
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209 views

ekiga — could not register (Forbidden, please check that the username and password are correct)

What are the connection parameters for ekiga? I went to ekiga.net and reset my password, still no luck. I've tried more than a few variants: Add a SIP account To add a SIP account, simply click ...
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95 views

topology for an unmanaged switch (firewall)

I'm considering an unmanaged switch. My understanding is that many of these devices explicitly lack a firewall. In that case, what do you use as a firewall? I suppose one option would be to use a ...
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1answer
129 views

Not registering on Asterisk over VPN

I want to work in local area from home, I configured OpenVPN on my Asterisk server (it is only one Linux server in LAN), it works fine. I enabled forwarding on Asterisk server, and client now can ...
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1answer
253 views

Getting Asterisk PBX to do SIP URI dialling properly?

I've installed AsteriskNOW in a VM and I'm having a hard time getting calls from the PBX to head outbound to another SIP address on the SIP2SIP network I use for occasional testing purposes. However, ...
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1answer
291 views

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
206 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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328 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
1k 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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279 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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1answer
57 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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1answer
4k 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 ...
0
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1answer
179 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 ...
3
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2answers
151 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 ...
0
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1answer
95 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
760 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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3answers
2k 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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2answers
153 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
610 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
379 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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0answers
1k 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 ...