A couple questions before I even attempt this project... Is it possible to create a VoIP application in Java? Is it posssibe to do this using standard libraries? If you can't make one with standard libraries, which libraries are needed to accomplish this? Also, is this a good Introduction to Server and Networking in Java or should I start elsewhere? Thanks for the help.

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Hi all, I'm beginner developer and I want to develop a software telephone in .NET. I prefer C#. After some googling, I started to code in C# using the prewritten VoIP components of [Ozeki's VoIP SIP SDK](http://www.voip-sip-sdk.com). Now I have a simple softphone that is able to make and receive audio calls. But I want to extend my program with video calling functionality. Can anybody help me how to move on?

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I want to develop a voip billing system in php and mysql. Do you gays able to help me by giving me some tutorial links.Or some technical suggestion as how to start and how can I do it final.Thanks all in advance for reading my query and trying to help me.

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Hi all, I found a great VoIP application for WP7 that prevents the service providers to block SIP: http://www.codeproject.com/Articles/722556/How-to-build-a-VoIP-application-for-Windows-Phone. The core of the solution is the following: as it is known, SIP protocol is used in VoIP technology, but its port (5060) is blocked by many mobile service providers. That's why VoIP is blocked on mobile phones. By using this WP7 client application blocking will be impossible, since this application communicates with a server through TCP/UDP and the server communicates with the phone system through SIP. The author of the guide inserted above has used a Windows Phone SDK 7.1 …

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I am trying to develop a VIOP web application. Please does any body no how to do this in asp.net

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Hey guys, This question is pointed at the guys working with voip. Here's the story, One of my client brought me an ATA device telling me there is no more dial tone. I check the hardware and no physical damage. So i tried to enter the admin section. Did * * * * to access the device and get the ip, but the line cut. The 2 phone lines are basicly dead. So i get the ip from the router and connect on it via the GUI, suprisingly it work. The original setup configuration from our company wasn't change. My …

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Hi everybody, I’m a student learning ASP and I have a project to develop some VoIP applications. I would like to use sample programs by Ozeki VoIP SIP SDK because they have trial version for free. Have any of you tried these sample programs? For example this one: http://www.voip-sip-sdk.com/p_203-asp-net-sip-voip-client-voip.html If yes, could you please give me a review of it? Thanks for your time in advance! Regards,

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Ahoi, I am currently developing a Flash client for SIP communication. My biggest help on the subject is the following website, where I have found a great sample program: http://www.voip-sip-sdk.com/p_97-flash-sip-client-example-voip.html The sample program is about how to make a Flash softphone for SIP communication. I hope you will like it as much as I do. Greetings, Gedeon

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I have just downloaded this C# Command Line Caller sample program of Ozeki VoIP SIP SDK: http://www.voip-sip-sdk.com/p_163-c-command-line-caller-voip.html It is very easy to use and meets my requirements, but I would really appreciate some extra info from more experienced developers. Has anyone ever built a C# Command Line Caller?

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Hello everyone, I am a PhD student in Stockholm, studying VoIP technology. I am in the middle of writing my dissertation, about command line calling. As I'm doing my researches, I've already found some very interesting research material, such as this page: XxXwww.voip-sip-sdk.com/p_251-how-to-use-the-command-line-caller-example-with-ozeki-voip-sip-sdk-voipXxX (cancel the X-s) It would be great to find someone to discuss this program, or maybe a whole group, because it would really help me with moving on. Any advice is welcome! Thx gemma

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Hi All I am finding a solution for make a calls from pc. Let me to explain what I need to do exactly. <- What I have -> * I have a per recorded voice cut and I saved it on my pc. * I have a telephone numbers collection and those all numbers are local numbers. <- What I want to do -> * I need to make a call for that all numbers in my collection. I need to play that I saved voice track as my phone call. <- How I do That -> I need to …

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Hello, I've got an event management company, and I spend a lot of time with hanging on the phone, and also online. I've found out something lately which can make organizing smoother, faster, and more comfortable. But I also have a problem. See, I'm expert in business life, but I don't know much about programming... I think this software could be very useful for my company, but I don't know nothing about its quaility. According to the site, there are downloadable sample programs. It would be a great help, if I could get to know your expert opinion about them! …

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Hi fellow developers :) I plan to build a C# softphone, but I'm not very secure in my knowledge, so I've done some research. My softphone must be able to register with a SIP service provider. That's priority #1. So my research has included this condition, too. Long story short, I've found this great VoIP SIP SDK, and I've already tried the many sample programs which also seem good. Because I'm always searching for the best, I tend to be a little (means: very) insecure, so I'd like to hear other people's opinion about the issue. If anyone would like …

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I recently came across [URL="http://www.twilio.com/"]Twilio.com[/URL] that provides API facilities to implement voice or text capabilities through the internet. They aren't the first to provide this kind of service but the capability of the API and their pricing seem to make them worth looking at for anyone who has a need for this type of facility. The service is mainly intended for North America at this point however, they do support international outbound calls. Twilio can get you your own phone number for $1 / month ($2 toll free) if you need it. It is pay-as-you go at 1 cent / …

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Hi, I am looking to develop a software which can initiate phone call from Computer thru VoIP Gateway. I have found some applications, where I should manually dial the phone number. But I need to trigger call by system itself based on some incidents. Can anyone suggest what technology/languages should I use to develop this kind of application ? I am a beginner for this. I don't have any idea where should I start to develop this kind of applciation. Thanks Reddy

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What are the primary differences between wireless voice and paging systems.

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hi everyone. Just out of curiosity more than anything; does anyone know of a library that can grab microphone input (on windows)? I'm looking into how to write a kind of VoIP (voice ip) program. I know how to use sockets for sending/receiving data, but I just need the microphone aspect. Any kind of info/resources would be greatly appreciated. Thank you!

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So Google is going to compete with Skype. If you weren't signed up to the GrandCentral service the company acquired, forget it - as per the info on [URL="http://www.google.com/voice/about"]this link[/URL], the service is only available for existing customers right now. All the same, it's an interesting move. At the moment [URL="http://www.skype.com"]Skype[/URL], owned by eBay, is the default VoIP solution for most domestic customers. Businesspeople need something a little more serious. Google could perceive itself as that serious player. I'm less interested in the impact of this announcement on the home user - they'll end up using something and paying very …

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[URL="http://skype.com/welcomeback/"]Skype[/URL] is an excellent VoIP phone service for telecommuters or company employees who travel a lot. You can make and receive calls from your computer for free, and get a personalized phone number, voicemail, and other upgrades for a small fee. Skype announced a new fee-based feature this week, voice-to-text messaging, that's a great conceptual idea but isn't ready for prime time. The service already offers free email notification that someone is trying to reach you via the service, and will also send you an SMS notification if you have a voicemail message waiting, but neither give details about the …

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[URL="http://www.gipscorp.com"]Global IP Solutions[/URL] has one big claim to fame in that it invented the Internet Engineering Task Force (IETF) iLBC codec standard. OK, you might not have heard of this if you are not a card carrying geek, but you have probably benefited from the iLBC codec. This narrowband speech algorithm was designed specifically to allow for better quality voice calls across the Internet. As well as being employed within the VoIP technology of many Internet Service Providers, iLBC is also part of the iPhone itself. Now GIPS VoiceEngine Mobile promises to enable Voice over IP for the iPhone. Third …

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[URL="http://www.frsirt.com/english/advisories/2008/0928"]FrSIRT[/URL], the French Security Incident Response Team, has reported that multiple vulnerabilities have been identified in various IP-PBX software applications that can be exploited by attackers to bypass security restrictions and cause denial of service attacks or otherwise compromise vulnerable systems. The software is used by an ever increasing number of companies in order to computerise their telephone switchboard systems and implement low cost Internet calls. A number of issues have been highlighted by FrSIRT, including a buffer overflow error in the RTP payload handling code when processing a malformed INVITE or SIP packet with SDP. This could be exploited …

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In one of the most incredible cases of I did not do it syndrome, eBay owned VoIP supremo Skype has denied that it was at fault over the system outage which started on Thursday 16th August and prevented the vast majority of its users from being able to login to the peer-to-peer voice network for 48 hours. In an [URL="http://share.skype.com/sites/en/2007/08/what_happened_on_august_16.html"]official statement[/URL], Skype claims that the disruption was "triggered by a massive restart of our users’ computers across the globe within a very short timeframe as they re-booted after receiving a routine set of patches through Windows Update. The abnormally high …

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AOL has announced its [URL="http://developers.aimphoneline.com/"]AIM Phoneline Developer Initiative[/URL] that will allow voice application developers and device manufacturers to create new tools to extend the functionality of the still relatively new AIM Phoneline service. Examples of the new APIs for call personalization (or ringtones as mere non-marketing mortals might say), untethered devices (that will be cordless handsets then) and incoming call management (caller ID and the like) will be on show at booth 449 at the Fall 2006 VON conference, running from September 11th - 14th at the Boston Convention and Exhibition Center. A move that makes good sense if AOL …

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AOL has announced its [URL="http://developers.aimphoneline.com/"]AIM Phoneline Developer Initiative[/URL] that will allow voice application developers and device manufacturers to create new tools to extend the functionality of the still relatively new AIM Phoneline service. Examples of the new APIs for call personalization (or ringtones as mere non-marketing mortals might say), untethered devices (that will be cordless handsets then) and incoming call management (caller ID and the like) will be on show at booth 449 at the Fall 2006 VON conference, running from September 11th - 14th at the Boston Convention and Exhibition Center. A move that makes good sense if AOL …

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The growing acceptance of IM in the workplace has, eventually, made an impression on [URL="http://www.aol.com"]AOL [/URL]which has started a public test of AIM Pro PE (Professional Edition). Although not expected to actually launch until the autumn, one has to wonder how much weight the consumer oriented AOL brand carries in the corporate marketplace and whether it can successfully carve a profitable niche there. Designed to cover a broad corporate church, everything from the individual IT professional through to the medium sized businesses, AOL have invested heavily in doing just that. Developed in conjunction with web conferencing and online meeting specialist …

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Telephone customers who use the relatively new Voice over Internet Protocol technology to power their phones need to understand how 911 dialing works. If they don’t, they’ll lose their phone service, according to the Federal Communications Commission. Here’s the reason: In the past, when emergency calls were received by 911 call centers from VoIP lines, the operators had no information as to the whereabouts of the caller. Unlike traditional landline phone service, which attaches detailed location information to all phone numbers, VoIP lines have no information. In the case of an emergency, when callers sometimes cannot give his or her …

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The End.