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

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2answers
66 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
15 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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0answers
21 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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0answers
28 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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46 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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2answers
231 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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29 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
95 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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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 ...
0
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1answer
77 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
172 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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0answers
403 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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0answers
55 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 ...
0
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0answers
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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0answers
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 ...
0
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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 ...
0
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1answer
125 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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0answers
36 views

ICE(rfc 5245) in call transfer and call hold/resume

In the ICE implementation , there is explanation about the subsequent offers. But there is no mention as to what should be agent's behaviour when subsequent Re-invites are sent ?? Should we include ...
0
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1answer
139 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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0answers
252 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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0answers
143 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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0answers
163 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
417 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
458 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
106 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 ...
0
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1answer
168 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
288 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 ...
0
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1answer
367 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 ...
0
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1answer
402 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. ...
0
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1answer
627 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
672 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
3k 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
740 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
votes
1answer
459 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
178 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
52 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
117 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 ...
3
votes
2answers
921 views

One way broadcast of SIP call using Wowza

I have a POTS conference call taking place and I want to live stream the audio over the internet using Wowza. My plan is to dial into the conference call essentially bridging the audio onto the Wowza ...
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vote
3answers
279 views

Migrating from Skype - Calling landlines?

I've been wanting to stop using Skype for quite a while, but now that they're being bought by Microsoft, I think it's about time to spring into action. I use Skype mainly to call landlines abroad - I ...
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1answer
164 views

MacOS IVR SIP client

I'm looking for a SIP client that provides IVR functionality on MacOS X. Is there something like that? Max
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2answers
480 views

VoIP (on a landline) vs SIP (on mobile)? What do I miss not using VoIP

A bit of a background. Thinking of moving away from a softphone, which I predominantly use for a long distance calls, a few months ago I got myself a Linksys SPA3000, got it configured (was not easy, ...
2
votes
1answer
1k views

program to dial land phone, enter password and record?

is there a program for Windows (or linux command line) platform that would do below from a command line? call a land phone number (using my SIP account) enter password record the call finishes after ...
0
votes
2answers
3k views

How to set up personal VoIP server?

I'm looking to run my own VoIP server so I can make and record calls and the like. I need to basically bind a phone number to the server and me able to call it and use it as a regular phone. I'm new ...
0
votes
1answer
34 views

How to split registration and media?

I have a SIP project. Where i will have SIP server running. Server will do following: will only do routing and receive incoming calls But the audio/video will be peer 2 peer Can this be done with ...
8
votes
3answers
18k views

What's the most advanced SIP client for Linux these days? [closed]

I'm currently struggling which SIP client software to use with respect to Ubuntu / Gnome. Some clients I've looked so far: Blink, seems promising but the Linux variant lacks a lot of features ...
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vote
2answers
913 views

Is there any use of SIP on top of TOR

Does it make any sense it terms of perfomance and latency?As far as i know TOR is a transports layer protocol trying to encapsulate the cells with onion routing in order to enhanse privacy.Since sip ...
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2answers
7k views

Softphone for 64-bit Windows 7 to make SIP calls without registering with a SIP proxy?

We have test tools that require us to call SIP addresses like localhost:5061. I used to use SJPhone on Windows XP, and an older version of X-lite, which both worked fine, and didn't require the SIP ...
2
votes
3answers
209 views

Provider independent SIP address

I'm currently investigating getting a (private) SIP account and have looked around various providers. As far as I can see they all give you addresses like [email protected] but if I would ...
0
votes
1answer
6k views

DrayTek 2820 configuration using public IP addresses

I have a /29 range of public IP addresses assigned to me by my ISP. I'm trying to configure a SIP VOIP handset to register with my VOIP provider who recommend using public IP addresses rather than ...
0
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0answers
639 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 ...