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Lua scripting - dozen events that can trigger scripts, few dozen custom functions, global variables and queues for connecting multiple scripts and plugins together; few dozen script examples, including "Lenny" and scanning LAN with OPTIONS
added companion application for record files browsing - RecordViewer.exe
added SIP presence subscription
remote identity and call direction display for BLF (dialog-info) buttons (displaying who is calling who if PABX passes this information)
calls can be recorded in stereo (call parties in separate channels)
wave files can be used as audio source (instead of microphone); audio sources can be switched during the call (IVR-like applications)
added RTP streaming (multicast/unicast paging) function
new codecs: G.722, G.729 (as separate DLL), L16, Opus
network adapter selection
few new plugins, including text-to-speech, physical GPIO using FT232RL module
more command-line commands, including option to pass Lua script this way
added software volume control
kiosk mode
configuration patching mechanism, useful e.g. for provisioning purposes
sending/receiving text messages (SIMPLE)
translation mechanism (limited mostly to main window) and few translations (JSON/i18n)
many new GUI customization options (examples attached)
many new Lua scripting functions
built-in list of custom Lua functions
TLS, SRTP and ZRTP support
support for multiple simultaneous calls with attended transfer and conference
calls can be recorded also as Opus/OGG
video support (separate build)
for version with video support: many new audio and video formats can be used to transmit, e.g. mp3 files, mp4 files, http internet radio
new plugins: HID telephony support, TCP server, G.729 codec using Belledonne Communications code, codec2, Philips VOIP1511 handset, WS2812 LEDs through UART, mpv video player (allowing e.g. integrating with RTSP cameras)
RecordViewer: option to transcribe call recordings using local whisper.cpp