QuteCom (formerly WengoPhone) is a multi-platform VoIP client. The GUI is Qt-based, and the Video-over-IP engine is based on the eXosip, oSIP, oRTP, ffmpeg, and libgaim projects. The eXosip module is extended by a phApi module, which implements a high-level, easy-to-use call control API. It supports PC-to-PC voice, video, and chat. One can use a standard SIP service provider such as Wengo to be assigned an incoming number, make calls to PSTN/cell phones, get voice mail, and more. In addition to SIP/SIMPLE QuteCom provides IM functionality using libgaim, so it is compatible with all protocols supported by libgaim.
Asterisk Phonebook is a common shared phone book directory built for Asterisk PBX. It stores names and numbers into a database which is used by clients. In addition, the central directory can be opened by snom phones, in which the XML-side of the Asterisk PBX is fetched. Incoming calls are displayed with their name, and number-to-name resolution will look up from the local and global phone books. Calls from PSTN resolve through the landline provider.