Cisco Jabber for Linux?

Some people at our company are using a so called Cisco Jabber in Windows OS to improve handling of phone calls directly at the PC instead of using the telephone anymore. ---------- After installation, one has to register the client to the server just with a username@company.com and the corresponding password. Subsequently it is possible to search for names and numbers within the client (probably LDAP-request) and handle incoming and outgoing calls without using the hardware telephone keyboard anymore. **Is there some alternative available that works on Linux systems?**