Callweaver is a community driven software PBX project. The most important differences between Callweaver and Asterisk are built-in STUN support, the use of SpanDSP for better codecs and full T.38 fax over IP support, Sqlite instead of Berkeley DB, universal jitterbuffer, POSIX timers to avoid Zaptel timing dependencies, greater speed, more efficient dialplan execution, and greater stability. License: GNU General Public License (GPL) Changes: Some known bugs still exist, but the new code now allows for all three modes of T.38 (Gateway, Endpoint, and Passthrough) quite stably with most hardware. The latest spandsp library is required, currently version 0.0.4pre15.

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