Gatekeeper is very stable. It is being used commercially by many organizations to provide VOIP or conferencing services. we provide executables for Linux, Windows, MacOS X, Solaris, FreeBSD, OpenBSD and NetBSD can run as a Windows service accounting and call authorization via SQL database, Radius, file or external application database drivers for ODBC, MySQL, PostgreSQL, SQLite and Firebird flexible call routing number rewriting (calling and called) support for NAT traversal (H.460.18/H.460.19, H.460.23/H.460.24 or own method) full H.323 proxy TCP interface to applications CTI functions (eg. VOIP call-center, call transfers) gatekeeper clustering support (neighbors, parent/child, alternates) H.235 security graphical user interface