Linphone is an internet phone or Voice Over IP phone (VoIP), it helps to communicate freely with people over the internet, with voice, video, and text instant messaging. Linphone is available for Linux, Windows, MacOSX, and for mobile phones: Android, iPhone, Blackberry. It is using SIP protocol and it is compatible with any voip operator using SIP for its network. It provides Liblinphone, a powerful SIP VoIP video SDK that anyone can use to add audio or video call capabilities to an application. It supports IPv6, Webcam, Addressbook and lot more. 
 <img src="/AppImages/Article/linphone-img1.jpg" alt="" class="float-center">

Linphone is an internet phone or Voice Over IP phone (VoIP), it helps to communicate freely with people over the internet, with voice, video, and text instant messaging. Linphone is available for Linux, Windows, MacOSX, and for mobile phones: Android, iPhone, Blackberry. It is using SIP protocol and it is compatible with any voip operator using SIP for its network.

Linphone - Video SIP phone for Desktop and Mobile

Kamailio (successor of former OpenSER and SER) is an open source implementation of a SIP Signaling Server. SIP is an open standard protocol specified by the IETF. The core specification document is RFC3261.
 
The Kamailio SIP server is designed for scalability, targeting large deployments (e.g. for IP telephony operators or carriers, which have a large subscriber base or route a big volume of calls), but can be also used in enterprises or for personal needs to provide VoIP, Instant Messaging and Presence. Kamailio is well known for its flexibility, robustness, strong security and the extensive number of features.
 
Among the powerful features: asynchronous TCP, UDP and SCTP, secure communication via TLS for VoIP (voice, video, text); WebSocket support for WebRTC; IPv4 and IPv6; SIMPLE instant messaging and presence with embedded XCAP server and MSRP relay; asynchronous operations; IMS extensions for VoLTE; ENUM; DID and least cost routing; load balancing; routing fail-over; accounting, authentication and authorization; support for many backend systems such as MySQL, Postgres, Oracle, Radius, LDAP, Redis, Cassandra, MongoDB, Memcached; Json and XMLRPC control interface, SNMP monitoring.

Kamailio (successor of former OpenSER and SER) is an open source implementation of a SIP Signaling Server. SIP is an open standard protocol specified by the IETF. The core specification document is RFC3261.

Kamailio - The Open Source SIP Server

Empathy is a messaging program which supports text, voice, and video chat and file transfers. It supports private and group chat and logs the complete conversation. It currently lacks privacy and encryption support. <img src="/AppImages/Article/empathy-img1.png" alt="" class="float-center">

Empathy is a messaging program which supports text, voice, and video chat and file transfers. It supports private and group chat and logs the complete conversation. It currently lacks privacy and encryption support. 

Empathy - Instant Messaging for GNOME

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Linphone - Video SIP phone for Desktop and Mobile

Kamailio - The Open Source SIP Server

Empathy - Instant Messaging for GNOME

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Linphone - Video SIP phone for Desktop and Mobile

Kamailio - The Open Source SIP Server

Empathy - Instant Messaging for GNOME

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