sip_helper 0.1.3

A lightweight SIP/VoIP library for Flutter. SIP protocol (UDP), RTP audio transport, G.711 A-law codec, and Windows audio via WinMM FFI.

0.1.3

• Fix: hanging up an outgoing call while ringing now sends SIP CANCEL instead of BYE, so the remote side stops ringing.
• Fix: late 200 OK received after CANCEL is properly ACKed and followed by BYE.
• Fix: 487 Request Terminated response is now ACKed correctly.

0.1.2

• Updated dependencies: ffi ^2.2.0, crypto ^3.0.7, lints ^6.1.0, test ^1.30.0.

0.1.1

• Fix: AudioPlayerService was not initialized by SipHelper, causing no voice playback during calls.

0.1.0

• Initial release.
• SIP protocol support over UDP (REGISTER, INVITE, BYE, ACK, CANCEL).
• RTP audio transport with sequence numbering and timestamping.
• G.711 A-law (PCMA) encoder and decoder.
• Windows audio capture and playback via WinMM FFI.
• Audio level metering (RMS-based, normalized 0.0-1.0).
• Pure Dart SIP configuration and call info models.
• Pluggable logging abstraction.