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Starting March 27, 2026, RC is rebranded as Nexconn. Existing RC SDK customers can continue using this documentation. New customers should refer to the Nexconn developer documentation.

Release Notes

5.28.0​

Release Date: 2025/09/29

  • RTCLib SDK
    • Launched AI-powered real-time speech translation.
  • CallLib SDK
    • Launched AI-powered real-time speech translation.
  • CallKit SDK
    • Launched AI-powered real-time speech translation.
    • Launched LiveCommunicationKit.

5.26.0​

Release Date: 2025/09/05

  • RTCLib SDK
    • Launched AI-powered real-time speech recognition.
  • CallLib SDK
    • Launched AI-powered real-time speech recognition.
  • CallKit SDK
    • Launched AI-powered real-time speech recognition.

5.24.0​

Release Date: 2025/07/25

  • RTCLib SDK
    • Fixed an issue where room heartbeat continued after leaving during network disconnection.
  • CallLib SDK
    • Unified internal timestamps to server timestamps.
  • CallKit SDK
    • Unified internal timestamps to server timestamps.

5.20.0​

Release Date: 2025/05/30

  • RTCLib SDK
    • Optimized internal logic.
  • CallLib SDK
    • Optimized internal logic.

5.12.1​

Release Date: 2024/12/16

  • CallLib SDK
    • Added lastCallSession property to RCCallClient class, effective after the current call ends until the next call concludes.

5.12.0​

Release Date: 2024/10/18

  • CallKit SDK
    • Adapted for iOS 18, resolving UI crash issues.

5.10.1​

Release Date: 2024/08/29

  • RTCLib SDK
    • Disabled bitcode.
  • CallLib SDK
    • Disabled bitcode.
  • CallKit SDK
    • Disabled bitcode.

5.10.0​

Release Date: 2024/06/28

  • CallLib SDK
    • Fixed issues when using both CallKit and CallPlus adaptation layers.

5.8.2​

Release Date: 2024/06/05

  • RTCLib SDK
    • Updated SDK version to 5.8.2 with no new features or fixes.
  • CallLib SDK
    • Updated SDK version to 5.8.2 with no new features or fixes.
  • CallKit SDK
    • Updated SDK version to 5.8.2 with no new features or fixes.

5.8.1​

Release Date: 2024/04/03

  • RTCLib SDK
    • Updated SDK version to 5.8.1 with no new features or fixes.
  • CallLib SDK
    • Updated SDK version to 5.8.1 with no new features or fixes.
  • CallKit SDK
    • Updated SDK version to 5.8.1 with no new features or fixes.

5.8.0​

Release Date: 2024/03/29

  • RTCLib SDK
    • Updated SDK version to 5.8.0 with no new features or fixes.
  • CallLib SDK
    • Updated SDK version to 5.8.0 with no new features or fixes.
  • CallKit SDK
    • Updated SDK version to 5.8.0 with no new features or fixes.

5.6.9​

Release Date: 2024/01/31

  • RTCLib SDK
    • Added Framework with PrivacyInfo.xcprivacy.
    • Fixed occasional PK failure issues.
  • CallKit SDK
    • Added Framework with PrivacyInfo.xcprivacy.

5.6.8​

Release Date: 2023/12/29

  • RTCLib SDK
    • Fixed internal known issues.

5.6.7​

Release Date: 2023/11/30

  • RTCLib SDK
    • Fixed occasional crashes.
  • CallLib SDK
    • Fixed occasional crashes.

5.6.5​

Release Date: 2023/10/12

  • RTCLib SDK
    • Fixed black screen issue after reconnection in cross-room co-streaming scenarios.
  • CallLib SDK
    • Fixed issue where subsequent calls couldn't be received after leaving a room during network disconnection.

5.6.4​

Release Date: 2023/09/25

  • RTCLib SDK
    • Fixed cloud recording not ending when leaving a room.

5.6.3​

Release Date: 2023/08/31

  • RTCLib SDK
    • Updated SDK version to 5.6.3 with no new features or fixes.
  • CallLib SDK
    • Updated SDK version to 5.6.3 with no new features or fixes.
  • CallKit SDK
    • Updated SDK version to 5.6.3 with no new features or fixes.

5.6.2​

Release Date: 2023/08/11

  • RTCLib SDK
    • Updated SDK version to 5.6.2 with no new features or fixes.
  • CallLib SDK
    • Updated SDK version to 5.6.2 with no new features or fixes.
  • CallKit SDK
    • Updated SDK version to 5.6.2 with no new features or fixes.

5.6.1​

Release Date: 2023/07/14

  • RTCLib SDK
    • Updated SDK version to 5.6.1 with no new features or fixes.
  • CallLib SDK
    • Updated SDK version to 5.6.1 with no new features or fixes.
  • CallKit SDK
    • Updated SDK version to 5.6.1 with no new features or fixes.

5.6.0​

Release Date: 2023/07/03

  • RTCLib SDK
    • Updated SDK version to 5.6.0 with no new features or fixes.
  • CallLib SDK
    • Updated SDK version to 5.6.0 with no new features or fixes.
  • CallKit SDK
    • Updated SDK version to 5.6.0 with no new features or fixes.

5.5.0​

Release Date: 2023/09/08

  • RTCLib SDK
    • Updated SDK version to 5.5.0 with no new features or fixes.
  • CallLib SDK
    • Updated SDK version to 5.5.0 with no new features or fixes.
  • CallKit SDK
    • Updated SDK version to 5.5.0 with no new features or fixes.

5.4.6​

Release Date: 2023/06/15

  • CallLib SDK
    • Optimized CallKit avatar configuration to follow IMKit settings.
  • CallKit SDK
    • Fixed incorrect callback interfaces for local rendering frames and sent frames.

5.4.5​

Release Date: 2023/05/29

  • CallLib SDK
    • Fixed occasional crashes.
  • CallKit SDK
    • Fixed occasional crashes.

5.4.4​

Release Date: 2023/05/11

  • RTCLib SDK
    • Resolved low uplink bitrate causing blurry video on iOS 16.4.1.
    • Fixed crashes due to multi-threading in preheating logic.
    • Fixed crashes caused by Ping probe tool assertions.
    • Modified version matching rules between RTCLib and IM SDK. From 5.4.4 onward, the first two digits must match. Note: RTCLib 5.4.4 cannot match IM SDK versions below 5.4.4.

5.4.2​

Release Date: 2023/04/20

  • CallLib SDK
    • Added default vivo category parameter "IM" for push notifications.
  • CallKit SDK
    • Optimized push message display for one-to-one and group calls.

5.4.1​

Release Date: 2023/04/07

  • RTCLib SDK
    • Added new voice beautification effects.
    • Fixed automatic unsubscribe issue when leaving a secondary room in cross-room co-streaming.
  • CallLib SDK
    • Improved hang-up reasons when killing the app during incoming calls. Now shows "Call ended".
    • Fixed 1080p video resolution setting not taking effect.
  • CallKit SDK
    • Aligned multilingual prompts with Android.
    • Fixed earpiece audio issue for incoming voice calls.
    • Fixed unresponsive answer button when network disconnects after call UI appears.
    • Fixed Arabic UI adaptation issues.

5.4.0​

Release Date: 2023/03/03

  • RTCLib SDK
    • Fixed noise persistence when stopping multiple sound effects quickly.
    • Updated WebRTC library to prevent crashes from bandwidth detection.
  • CallLib SDK
    • Added default Huawei category "VOIP" for push notifications.
    • Filtered already-in-call users when re-inviting in group calls.
    • Added support for FaceUnity beauty plugin.
  • CallKit SDK
    • Fixed text overlap on iPhone 14 Pro Max in group video calls.
    • Aligned group call handling prompts with Android ("Processed on another device").
    • Added support for FaceUnity beauty plugin.

5.3.7​

Release Date: 2023/07/07

Updated SDK version to 5.3.7 to match IM SDK 5.3.7 stable release. No new features or fixes beyond version 5.3.5.

5.3.6​

Release Date: 2023/05/11

Updated SDK version to 5.3.6 to match IM SDK 5.3.6 stable release. No new features or fixes beyond version 5.3.5.

5.3.5​

Release Date: 2023/02/10

  • CallKit SDK
    • Fixed incorrect avatar display in 3-person group audio calls after initiator hangs up.
    • Fixed incorrect avatar display for unaccepted group call invitations.
    • Fixed selected member count display in group call invitation UI.
    • Fixed inconsistent "connecting" status display in group calls.

5.3.4​

Release Date: 2023/01/17

  • RTCLib SDK
    • Added failed resource list return for stream subscription.
    • Added remotePlaybackVolume interface for remote audio adjustment.
    • Expanded local audio gain range from [0-100] to [0-200].
    • Fixed logServerUrl not updating when switching AppKeys without engine destruction.
    • Optimized AudioSession configuration for different iOS versions.
    • Improved SEI video frame processing to prevent deadlocks.
  • CallLib SDK
    • Fixed push template ID misassignment.
    • Improved multi-device call handling.
    • Ignored offline RC:VCInvite messages for same UserId multi-device login.
  • CallKit SDK
    • Fixed loading image alignment for notch displays.
    • Fixed avatar highlight in group audio calls.
    • Resolved loading state display during active calls.
    • Fixed apnsCollapseId assignment in group calls.

5.3.3​

Release Date: 2022/12/28

  • RTCLib SDK
    • Fixed increasing latency in CDN live streaming under weak networks.
    • Fixed no sound in audio mixing with iOS16 or Bluetooth headsets.
    • Resolved deadlock when stopping online audio mixing.
    • Made audio device reset asynchronous during unInit.
    • Fixed CDN player freezing during Wi-Fi to cellular handover.
  • CallKit SDK
    • Fixed checkbox alignment in multi-party call selection UI.
    • Fixed crash when deleting non-existent collectionView items.

5.3.2​

Release Date: 2022/12/02

  • RTCLib SDK
    • Added CarPlay Bluetooth support (PlayBack mode for audience).
    • Auto camera turn-off when hosts switch to audience mode.
    • Improved room leave timing by canceling pending tasks.
    • Fixed ijkPlayer latency accumulation.
    • Resolved Bluetooth device switching unmuting local streams.

5.3.1​

Release Date: 2022/11/18

  • RTCLib SDK
    • Optimized initial rate control to reduce stuttering.
    • Fixed host timeout detection after audience promotion.
    • Resolved audio device startup failure (error -50).
    • Fixed crashes from multi-threaded remote user list access.
    • Cleared task queue when leaving rooms to prevent audio persistence.

5.3.0​

Release Date: 2022/11/04

  • RTCLib SDK
    • Launched CDN player component for external URL playback.
    • Officially supported SEI (Supplemental Enhancement Information).
    • Improved retry logic for room operations.
    • Enhanced volume adjustment based on auditory feedback.
    • Strengthened AVCaptureSession error handling.
    • Optimized built-in CDN streaming speed.
    • Fixed SDP log truncation.
    • Resolved RCRTCModifyVideoResourceOperation hanging during IM disconnection.
    • Fixed resource synchronization issues during remote device toggling.

5.2.5​

Release Date: 2022/09/09

  • RTCLib SDK
    • Released FaceUnity beauty plugin integration.
    • Added media library access for background music/sound effects (requires MediaPlayer.framework).
    • Added audio device startup failure callback.
    • Aligned multi-platform stream resolutions.
    • Reduced CPU usage through audio module optimization.
    • Accelerated setRemoteSDP operations.
    • Enhanced 3A processing with background music reference.
    • Enabled independent playback of background music/sound effects.
    • Added hidden toggle between WebRTC 3A and Huawei VQE.
    • Improved sample rate monitoring logic.
    • Added stream subscription validation.
    • Fixed green edges in iPhone 8 screen sharing.
    • Resolved video cropping in repeated screen sharing.
  • CallLib SDK
    • Fixed Web call compatibility when MediaId is missing.
  • CallKit SDK
    • Added iOS 14 compatibility.

5.2.4​

Release Date: 2022/07/22

  • RTCLib SDK
    • Blocked invalid host subscription operations.
    • Accelerated CDN live stream startup.
    • Fixed dual-channel audio failure during scene switching.
    • Corrected remote audio stream callback data.
    • Resolved camera resolution setting failures.
    • Fixed memory leaks with 1080p on low-end devices.
    • Improved RongRTCReplayKitExt screen sharing termination.
  • CallKit SDK
    • Fixed voip AudioSession startup failures.

5.2.3​

Release Date: 2022/06/01

  • RTCLib SDK
    • Added audio routing functionality.
    • Fixed occasional distorted audio for audiences.
    • Resolved thread blocking issues.
    • Fixed random crashes.

5.2.2​

Release Date: 2022/05/01

  • RTCLib SDK
    • Fixed internal bugs.

5.2.1​

Release Date: 2022/04/01

  • RTCLib SDK
    • Fixed internal bugs.

5.2.0​

Release Date: 2022/03/01

Starting from version 5.2.0, CallKit/CallLib/RTCLib must maintain version consistency with their dependent IMKit/IMLib SDKs (the first three digits must match).

  • RTCLib SDK
    • Added uinit interface for resource release post-livestream.
    • Supported BGRA format watermarks.
    • Added placeholder image support for cross-room co-streaming.
    • Optimized ijkplayer memory management.
    • Fixed voice effect plugin initialization.

5.1.17​

Release Date: 2022/01/26

  • RTCLib SDK
    • Added system audio capture during screen sharing.
    • Added pre-call network detection interface startLastmileProbeTest.
    • Supported placeholder images in cross-room co-streaming.
    • Optimized CDN streaming latency.
    • Reduced noise in music modes.
    • Fixed RongRTCPlayer plugin memory leaks.
  • CallLib SDK
    • Fixed offline call state persistence after reconnection.

5.1.16​

Release Date: 2022/01/13

  • RTCLib SDK
    • Fixed audio mixing state callbacks.
  • CallLib SDK
    • Resolved group call failures when groupId equals userId.
  • CallKit SDK
    • Fixed speaker audio after background-to-foreground transition.
    • Resolved group call invitation popup issues.

5.1.15​

Release Date: 2021/12/24

  • RTCLib SDK
    • Added video watermarking for live/meeting scenarios.
    • Fixed VideoView FillMode inheritance.
    • Resolved camera switch mirroring failures.
    • Fixed repeated SetVideoView display issues.
    • Improved AirPods volume in music mode.
    • Corrected cloud recording parameters.
    • Fixed individual sound effect volume adjustment.

5.1.14​

Release Date: 2021/12/10

  • RTCLib SDK
    • Added room join extension info support.
    • Implemented multi-device kick policies.
    • Improved call recovery after phone interruptions.
    • Fixed Bluetooth headset microphone data issues.
  • CallKit SDK
    • Fixed UIScene + UIAlertView crashes.

5.1.13​

Release Date: 2021/11/29

  • RTCLib SDK
    • Added stereo audio switching for karaoke scenarios.
    • Improved call interruption recovery.
    • Removed Audio background mode requirement.

5.1.12​

Release Date: 2021/11/12

  • RTCLib SDK
    • Added voice effects (beautification, pitch-shifting, reverb).
    • Reduced noise in audio chat rooms.

5.1.11​

Release Date: 2021/11/02

  • RTCLib SDK
    • Added online file playback (HTTP/HTTPS/RTMP/RTSP).
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