If you are in the market for a softphone, you may be wondering if there are any open source options available. Here are the top 5 softphone open source choices that you can consider.

Softphone Open Source: The Top 5 Choices

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Introduction

Though there are many VoIP clients available in the market, not all of them may offer you the features that you are looking for. In such a scenario, it is best to go for a softphone open source solution. With an open source softphone, you can get access to the source code and make changes to it as per your requirements.

In this article, we will list down the top 5 softphone open source solutions that you can use.

1. Asterisk
Asterisk is one of the most popularopen source VoIP platformsavailable in the market. It can be used to develop both VoIP clients and servers. Asterisk comes with a wide range of features including support for a large number of IP phones, VoIP protocols, andconference calls. Moreover, it also offers features like voicemail, call recording, and caller ID.

2. FreeSWITCH
FreeSWITCH is another popular open source VoIP platform that can be used to develop both VoIP clients and servers. It supports a wide range of VoIP protocols and also offers features like voicemail, call recording, and caller ID. FreeSWITCH also offers support for a large number of IP phones and conference calls.

3. Kamailio
Kamailio is an open source SIP server that can be used to develop both VoIP clients and servers. It supports a wide range of SIP features and also offers support for a large number of IP phones and conference calls. Kamailio also offers voicemail, call recording, and caller ID features.

4. OpenSIPS
OpenSIPS is an open source SIP server that can be used to develop both VoIP clients and servers. It supports a wide range of SIP features including support for a large number of IP phones, conference calls, voicemail, call recording, and caller ID features. OpenSIPS also offers load balancing features which makes it ideal for use in large deployments.

5 . Twinkle
Twinkle is an open source softphone that can be used to make VoIP calls using the SIP protocol . It supports many advanced SIP features including support for multiple simultaneous calls , call transfer , call forwarding , DTMF signaling , etc . Twinkle also offers echo cancellation , address book , missed call notification , etc .

Asterisk

Asterisk is a free and open source framework for building communications applications and is sponsored by Digium. Applications built on Asterisk include VoIP telephony, private branch exchanges, call centers and conference calling. It is used by small businesses, large businesses, call centers, carriers and government agencies, worldwide.

FreeSWITCH

FreeSWITCH is one of the most popular open source softphone platforms available today. It is very versatile and can be used for a variety of applications such as VoIP gateway, PBX, and IVR. FreeSWITCH also has a vibrant community of developers and users who are constantly improving the software.

Pros:
-Very versatile platform that can be used for a variety of applications
-Active community of developers and users
– improve the software

Cons:
– Not as user-friendly as some of the other options on this list

Kamailio

Kamailio (formerly OpenSIPs) is a very popular and well-respected open source SIP server that has been around since 2005. It is used by many large companies and organizations, such as Comcast, Cisco, Bloomberg, and Alcatel-Lucent. Kamailio is written in the C programming language and is known for being very fast and scalable. It can handle up to 10,000 calls per second and has many features, such as:

-Registrations
-NAT traversal
-Load balancing
-Moho detection
-MRTCP support
– call forwarding
-SIPREC support

OpenSIPS

OpenSIPS (Open SIP Server) is an open source VoIP platform for Enterprises and Service Providers. An all-in-one SIP proxy, OpenSIPS offers session management, presence, NAT traversal, load balancing and failover for VoIP and real time applications.

Some of the features offered by OpenSIPS include:
-Registrar server
-Location service
-Proxy server
-User agent server
-Energy Saving (DPI)
-Dispatcher
-Routing engine

Written in C language, OpenSIPS can run on multiple platforms including Linux, Windows, FreeBSD, and MacOS X.