This list of SIP software documents notable software applications which use Session Initiation Protocol (SIP) as a voice over IP (VoIP) protocol. Servers Free. Clients Free and open-source license. Blink, OSX, Linux. For Mac; CounterPath Corporation Bria desktop and mobile carrier-class.
Session Initiation Protocol (SIP) is used in Voice Over Internet Protocol (VoIP) communications. It allows users to make mostly free voice and video calls over the internet. Having a free SIP account is a great way to make free calls. You begin by choosing a SIP provider that assigns you a SIP account at no charge. Use it with softphone software, an app, or a VoIP-compatible phone.
Plan includes 100 users with unlimited extensions; great for teams.
Slack and Zendesk integrations.
Application suite can be a bit byzantine to navigate.
Still some documentation updating after the GetOnSIP migration to the OnSIP Free Plan.
OnSIP is a paid VoIP service offered by Junction Networks. However, the company also offers the OnSIP Free Plan to people who want to create a free SIP address. The OnSIP Free Plan provides a web-based voice, video, and messaging solution for teams. The features include:
The OnSIP Free Plan replaces the company's GetOnSIP program.
Straightforward service portfolio.
Free for life.
No options for PTSN termination; it's SIP-to-SIP only.
Barebones website raises questions of how long the company will be around.
IPTel.org provides IP telecommunications services and hosts several projects like the SIP Express Router, SIP Express Media Server, and the SIP Express Router Web. IPTel also provides a wealth of information on SIP communications on its website. The free SIP account IPTel offers is of good quality and is available with only a straightforward registration.
You are assigned a lifetime SIP account you can use to make audio and video calls with users of IPTel.org and other domains. You can access VoIP telephony services through web browsers without needing any special equipment, a SIP-compliant phone, softphone, or a smartphone app.
Free and easy to use.
Decent design.
Optimized for SylkServer.
Consumer-facing usage doesn't seem to be the developer's priority.
Separate apps for video and audio.
SIP2SIP is a straightforward SIP service offered by AG Projects. It is a free SIP service based on fair-use policy. Registration and account management are easy. AG Projects offers this free SIP service as one way for users to test the features present in its products. Using any of the compatible apps or clients you can:
Pure SIP-to-SIP provider.
Good documentation.
A few red flags; the official contact is in France and advertises his Gmail account.
The Antisip service offers a set of SIP-based services. Among them is a free SIP account that provides VoIP-to-VoIP services. The company recommends downloading its Antisip app for Android mobile devices, but the SIP account works with other devices.
Links to YouTube tutorials are available at the website for users who are new to the SIP experience.
Having a SIP account gives you the freedom to communicate through VoIP. Among the benefits is the ability to make and receive free phone calls to other SIP users worldwide, and to use a softphone software of your choice without being tied to what one VoIP service provider offers. Here are the best free SIP softphone apps and where to get them.
Compatible with most VoIP services and IP PBXs.
Format text in instant messages.
Consumes system resources.
No support for commercial use.
X-Lite is arguably the most popular SIP-based softphone app, widely used by individuals and business people alike. It's well-designed with a lot of features including QoS and a long list of codecs. CounterPath positions their free, entry-level app as an enticement for clients to purchase their more enhanced products such as EyeBeam and Bria.
Offers multiple VoIP codecs.
Edit the source code for a personalized experience.
Fewer features than similar apps.
No version for Mac users.
Formerly known as GnomeMeeting, Ekiga is general public license software for GNOME (Linux) and Windows. It offers all the basic features needed for good, fluid SIP communication in a clean, clear interface. Ekiga also offers free SIP accounts. You can use Ekiga for both voice calling and video conferencing.
Works well on any operating system.
Excellent mobile support.
Time-consuming to configure properly.
Documentation lacks detail.
Jitsi is a Java-built open-source instant-messaging (IM) application loaded with features. Along with other IM features, it also allows voice and video communication through SIP. Other interesting features include call recording, IPv6 support, encryption, and support for many protocols.
Well-organized interface.
Intuitive contact manager.
Lacks a clickable standard phone dialer.
Only supports VP8 video codec.
LinPhone is open-source software for Windows, MacOS, and Linux, plus Android and iPhone mobile platforms. LinPhone allows voice and video communication with a lot of interesting features, including many codecs, support for IPv6, echo cancellation, bandwidth management and more.
Easy Google Drive and OSX integration.
Offers a 'lite' version for Mac users.
No hotkeys or redial button.
Hold feature can be finicky.
Blink is simple but has all the features you need to make voice and video calls over SIP. Available for Windows, MacOS, and Linux, it's distributed under a GPL license.
I understand from the article that the VPN would fail, but that doesn't explain why the SSL Client would not even run/open at all on the MAC. Watchguard mobile vpn with ssl client software for mac.
Geolocation tool keeps track of friends.
Very lightweight.
Features are basic and limited.
No Windows, Mac, or mobile versions.
Empathy is more like an instant-messaging app that is also a fully featured SIP app. It works with many other protocols, as well. However, Empathy is strictly Linux software. It offers a full complement of features and compares well against instant-messaging tools that run on Android and other common platforms.
Supports dozens of languages.
Thorough online documentation.
Complicated set up process.
Only available for Windows.
MicroSIP is a free, open-source app that allows high-quality VoIP calls through SIP. It gets the job done without any surplus features, making it very light on resource usage and very nice to use if you just want to communicate simply and plainly. MicroSIP is a portable app.