The SvxLink project is developing a flexible, general purpose voice services system for ham radio use. The SvxLink Server consists of a core that handles the connection to the transceiver. The core can be configured to act as a repeater controller or to operate on a simplex channel. The voice services are loaded into the core as plugins, or modules as they are called in SvxLink.
The project also includes an EchoLink client GUI application (Qtel). Qtel is only an EchoLink client program. It does not have the sysop mode. That is, it cannot be connected to a transceiver and act as a link. For the latter, use the SvxLink Server.
http://sourceforge.net/apps/trac/svxlink/ - Trac pages for SvxLink
http://www.uarl.net/modules/myarticles/article.php?storyid=11 - SvxLink release 11.11 для Ubuntu/Debian
http://svxlink.sourceforge.net/featurelist.php - Feature List