As you may know, SLPhone is an open-source, KDE telephony client with support for multiple calls, multiple conferences, multiple accounts, text messages, background mode, record and playback, filter and search options and Akonadi integration, among others.
The latest version available is SLPhone 1.4.1, which has been released a while ago, coming with the below changes:
Video support by default
Ability to share screen
Ability to stream videos, images and text files
Support GnuTLS as an alternative to OpenSSL
Persistent camera configuration (per device)
Switch video sources during a call
Enable or disable video per account
Packet loss concealment
Builds with clang
Now a fully featured contact manager
Add, edit and manage contact sources
Delete contacts from the interface
Attach contact sources to auto completion or presence tracker
Basic video effects like rotate or enforce aspect ratio
Video full screen mode
In this article I will show you how to install SFLPhone 1.4.1 on Ubuntu 14.10 Utopic Unicorn, Ubuntu 14.04 Trusty Tahr, Linux Mint 17.1 Rebecca, Linux Mint 17 Qiana, Elementary OS 0.3 Freya, Deepin 2014, Peppermint Five, LXLE 14.04, Linux Lite 2.0, Pinguy OS 14.04, OpenSUSE 13.2, OpenSUSE 13.1, Fedora 20 and derivative systems.
Because it is available via repository, installing SLPhone 1.4.1 on Linux systems is easy. All you have to do is add the repository to your system, update the local repository index and install the needed package.
Follow the instructions for your system exactly, in order to get a successful installation.
How to install SFLPhone 1.4.1 on Ubuntu 14.10, Ubuntu 14.04 and derivative systems: