Main features on this new major release branch are:
* Instant Messaging. Using several different ?standards?: RFC4975, MSRP, T.140, SIP-IM etc etc.
* Much improved support for SIP event handling (SUBSCRIBE/NOTIFY/PUBLISH) using factories so more event packages can be added easily.
* Support for SIP ?dialog? event package.
* Support for Shared Line Appearance (aka Multiple Line Appearance, Bridged Line Appearance or Busy Lamp Field)
* Significant improvements in IPv6 support (thanks Yuri Kiryanov!)
* Major enhancements to the video rate controller.
* Removal of the old H.263 ffmpeg plug in and enhancement of the H.263-1998 plug it to take its place.
* H.224 support (H.323 only).
* SBC audio codec plug in.
* G.722 audio codec plug in.
* CELT audio codec plug in.
* SWIG support for use in other languages, Java first.
* Much improved multi-platform sample GUI client, OpenPhone. Now standard test environment replacing simpleOPAL.
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