SDK 5.5: Audio Improvements and New Features

SDK 5.5: Audio Improvements and New Features

Version 5.5 of the Linphone SDK is now available. This release introduces several enhancements on the audio and chat sides, with a strong focus on call quality.

Improved Audio Call Quality

SDK 5.5 includes an update of AEC3, WebRTC’s echo canceller, which is now more efficient and, above all, more adaptive. It automatically adjusts echo delay management during calls, significantly improving audio quality – especially on desktop environments that often lack hardware echo cancellation systems.

In addition, noise reduction based on the open-source project RNNoise has been added on desktop. It effectively reduces background noise without distorting the voice, even in noisy environments.

Message Editing and Deletion

Chat capabilities are evolving with the addition of features commonly found in consumer applications: remote message editing and deletion after sending within a conversation. Two deletion options are available: local deletion (visible only to the user) or deletion for all participants. After 24 hours, only local deletion remains available.

These improvements provide greater day-to-day flexibility and allow users to quickly correct mistakes or unintended messages.

New Policy for Ephemeral Messages

The behavior of ephemeral messages has been enhanced with a new policy. Message deletion no longer depends solely on all participants reading the message, as is the case with the default policy.

In practice:

• A message disappears after being read by a participant, following the expiration delay set by the sender.
• A longer delay, configurable at the service level, ensures automatic deletion of the message – even if it has not been read.

Bluetooth Headset Support

SDK 5.5 introduces support for Bluetooth telephony controls, with broad compatibility across most devices on the market, including Jabra headsets.

Key actions (answering calls, muting, audio control) can now be performed directly from the headset. These features will be available in version 6.2 of Linphone Desktop (macOS, Linux, and Windows), providing better integration with audio devices than web-based telephony solutions.