Open Phone Abstraction Library (OPAL) is a C++ multi-platform, multi-protocol library for Fax, Video & Voice over IP and other networks. Also included is the Portable Tool Library (PTLib) which is a C++ multi-platform abstraction library and collection o
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No docs - download doesn't run (missing opal64.dll) so a bit of non-starter.
Good and useful software
no trouble to install and run, works nicely.
A very useful library! Good support.