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-OPAL is an Open Source class library for the development of
-applications that use SIP / H.323 protocols for multimedia
-communications over packet based networks.
+The Open Phone Abstraction Library (OPAL) is a C++ multi-platform,
+multi-protocol library for Fax, Video & Voice over IP and other
+networks.
-This requires pwlib (also available at SlackBuilds.org)
+Opal requires ptlib and swig, which are also available at SlackBuilds.org.
+Speex from SBo is recommended, even though Opal ships with its own version.
+libavcodec, x264, and ffmpeg are optional, but highly recommended, for
+video support.