It was previously known as Gnome Meeting. It can be downloaded free. We can enjoy videoconferencing and VoIP calls through Ekiga. All H.323 compatible hardware and software can be used with Ekiga. We can use it with UNIX also. To use Ekiga, we should have SIP account. Meanwhile, to make PC to phone calls, you should have account with any VoIP service provider. Although Ekiga people recommend Diamond card Worldwide Communication Service but there are many other VoIP service providers like Vonage, Axvoice, Broadvoice etc.
It was earlier known as Gizmo Project. This is free software for pc to pc calls. Like other applications, it also has features like call recording, missed calls, messenger style text messages etc. It can be used for computer to phone calls too.
(Editor note: Gizmo5 has been acquired by Google on November 12, 2009)
The most commonly used VoIP application is Skype. It has approximately 500 million users across the globe. The reason behind its popularity is that it is built on the basis of another VoIP service and users do not have to deal with the complicated SIP settings. Although, Linux version of the product is not as comprehensive as that of windows but still it is useful for the people who want to use it on Linux. However, there are many who fail to detect camera with Skype.
This software is like an universal client for various instant messengers or chat software. Nearly all the chat software features are included in this software. This software is included in Gnome in its 2.24 version.
Twinkle is the most popular Linux based SIP software. It supports Linux only and it is an open source SIP client. We can use two lines simultaneously in Twinkle. It offers 3 way conference calling facility. It has in band as well as out of band DTMF. STUN support for NAT traversal is also available. It is available as a Firefox extension also.
This SIP user agent is also used for Linux. It supports IPv4 and IPv6. Kphone supports NAT-traversal STUN. It offers SRTP encryption for voice.
Check with your VoIP providerThe point to remember is that only software is not enough if you want to make VoIP calls. You have to subscribe with some VoIP provider also. There are several VoIP providers like Vonage, Axvoice and Skype etc. Some VoIP providers recommend particular software for their service. Before you install the software, you should ask your service provider if any particular application is required for their application.
Guest post: This article is written by Mr. Zach Ripples. Blogging is his passion and he has been doing this since he was an O level student. His favorite topic is VoIP technology. Currently He is working for Axvoice – Internet Phone Service Provider in USA and Canada.