H.323 and SIP compatible VoIP client

 H.323 and SIP compatible videoconferencing and VoIP/IP-Telephony application
 that allows you to make audio and video calls to remote users with H.323
 hardware or software (such as Microsoft Netmeeting) as well as SIP endpoints.
 .
 It supports all modern videoconferencing features, such as contact roster,
 presence status, high-quality audio and video codecs, various video
 resolutions, registering to an LDAP directory, gatekeeper support,
 making multi-user conference calls using an external MCU, using modern
 Quicknet telephony cards, and making PC-To-Phone calls.
 .
 Evolution plugin is in ekiga-plugin-evolution package.