VoIP SIP SDK for Flutter

Windows

Mac OS

Linux
Development environments
Visual Studio Code
Android Studio
XCode
Features
Support of SIP and RTP
Voice and video calls
Blind call transfer
Call audio recording (without UI)
IM
STUN support
Android 4.x, 5, 6, 7, 8 , 9 , 10 , 11, 12
iOS 9, 10, 11, 12, 13, 14, 15
Updates
Big Update VOIP SIP SDK for Flutter
August 29, 2025
Change log: – Updated iOS SDK to 20250805 – Updated Android SDK to 20250822 – Changed Flutter min version to 3.0.0 – Removed deprecated FlutterApplication class on Android – Set AbtoApplication as the default application on Android – Added 16k alignment on Android – Minimum supported version: Android 5.0 – Transitioned to new C++ library libc++_shared.so instead of libstlport_shared.so – Updated OpenSSL to 1.1.1w (Android & iOS) – Updated srtplib to 2.5.0 (Android) – Updated libSRTP to 2.5.0 (iOS) – Android API target level set to 35 – Internal engine improvements: fixed deadlocks, memory leaks, flow inconsistencies – Updated Android sample projects to target API level 35 – Added support for TLS 1.3 on iOS (disabled by default) – Added option on iOS to change secure transport encryption type via socketEncryptionOptions – Added option in iOS updateCall method to use SIP UPDATE instead of re-INVITE – Partial rebuild on iOS using latest Xcode for improved compatibility
Learn moreUpdate VOIP SIP SDK for Flutter
January 6, 2025
Try new features by downloading our latest update of VOIP SIP SDK for Flutter. Change log: Android target plugin is now implemented in Kotlin Android target updated to support Android 14 Android target updated with native Android VoIP SDK version 241104 Android target updated with newer versions of prerequisites: Gradle, AGP, etc added basic AbtoFlutterApplication Android Application class which extend FlutterApplication added advanced AbtoFlutterNotificationApplication …
Learn moreUpdate VOIP SIP SDK for Flutter
September 4, 2022
Please download our latest update of VoIP SIP SDK for Flutter. Change log: SDK is now distributed in plugin form, which simplifies integration in 3rd party project Native Flutter(Dart) widget for video views IM-related functionality: method to send IM and events to receive the incoming message or delivery status of a sent message License information support Updated native SDK’s (iOS and Android) Example application …
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VoIP SIP SDK for Flutter allows you to develop cross-platform SIP softphone for Android and iOS.