[Magmusacy]

Fixes iOS call audio going silent mid-call after another library deactivates the audio session or a CallKit call is held.

Problem

1. Other code (e.g. expo-audio after a sound) or CallKit (hold) deactivates the audio session.
2. iOS stops WebRTC's audio unit, but WebRTC still has it marked as started.
3. Nothing restarts it: microphone and playout stay silent; only rejoining helps.

Changes

1. Bumps FishjamWebRTC to 124.0.2.4 on iOS and Android (iOS: recover call audio after external audio session changes webrtc#3): WebRTC restarts its audio unit when something else stops it. The fix is iOS-only; Android is bumped to keep both platforms on the same version.
2. CallKitManager switches WebRTC audio off (useManualAudio + isAudioEnabled = NO) on hold, before fulfilling the hold action. CallKit deactivates the session only after that, so nothing restarts the unit while the call is held.
3. Audio is switched back on in provider:didActivateAudioSession: and when the call is cleaned up.

Apps should not stop or start the microphone on the held event: startMicrophone() creates a track that is never sent, so the other side hears silence after the call is resumed.

Testing

iPhone 16 + fishjam-chat + browser peer, with a local 124.0.2.4 build:

• expo-audio sound / setIsAudioActiveAsync(false) (foreground and background): audio back after ~0.4 s.
• CallKit hold → unhold, incl. app foregrounded, session deactivated, mic toggled or peer rejoining during the hold: silent while held, back after ~1 s, peer hears the mic.
• Call ended while held, then a new call: audio works.
• Regular call flows: no regressions.

[linear]

FCE-3912

[Copilot]

🔵 Needs a closer look

Native CallKit audio-session sequencing remains high-risk because the real cross-app “Hold & Accept” flow is untested.

0 open findings

What changed in this PR

Updates iOS WebRTC audio handling to recover after audio-session changes and CallKit holds.

Changes:

• Disables WebRTC audio while a call is held and restores it upon activation or cleanup.
• Upgrades FishjamWebRTC to 124.0.2.4.

File	Description
ios/​RCTWebRTC/​CallKitManager.m	Coordinates WebRTC audio state with CallKit hold and activation events.
FishjamReactNativeWebrtc.podspec	Bumps the native WebRTC dependency.

🧠 Review effort: Balanced

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