diff --git a/.openclaw-sync/source.json b/.openclaw-sync/source.json
index 390be70f6..fb7efb631 100644
--- a/.openclaw-sync/source.json
+++ b/.openclaw-sync/source.json
@@ -1,5 +1,5 @@
 {
   "repository": "openclaw/openclaw",
-  "sha": "da8621df0d2e31369eb82f54079b6f3cd845a1f9",
-  "syncedAt": "2026-04-23T02:57:54.195Z"
+  "sha": "c866820fedefb38458d675c7c86fa4c3ed6572c3",
+  "syncedAt": "2026-04-23T03:30:42.125Z"
 }
diff --git a/docs/plugins/sdk-migration.md b/docs/plugins/sdk-migration.md
index ced0f07f5..fdb6f4b24 100644
--- a/docs/plugins/sdk-migration.md
+++ b/docs/plugins/sdk-migration.md
@@ -279,7 +279,7 @@ Current bundled provider examples:
   | `plugin-sdk/provider-model-shared` | Shared provider model/replay helpers | `ProviderReplayFamily`, `buildProviderReplayFamilyHooks`, `normalizeModelCompat`, shared replay-policy builders, provider-endpoint helpers, and model-id normalization helpers |
   | `plugin-sdk/provider-catalog-shared` | Shared provider catalog helpers | `findCatalogTemplate`, `buildSingleProviderApiKeyCatalog`, `supportsNativeStreamingUsageCompat`, `applyProviderNativeStreamingUsageCompat` |
   | `plugin-sdk/provider-onboard` | Provider onboarding patches | Onboarding config helpers |
-  | `plugin-sdk/provider-http` | Provider HTTP helpers | Generic provider HTTP/endpoint capability helpers |
+  | `plugin-sdk/provider-http` | Provider HTTP helpers | Generic provider HTTP/endpoint capability helpers, including audio transcription multipart form helpers |
   | `plugin-sdk/provider-web-fetch` | Provider web-fetch helpers | Web-fetch provider registration/cache helpers |
   | `plugin-sdk/provider-web-search-config-contract` | Provider web-search config helpers | Narrow web-search config/credential helpers for providers that do not need plugin-enable wiring |
   | `plugin-sdk/provider-web-search-contract` | Provider web-search contract helpers | Narrow web-search config/credential contract helpers such as `createWebSearchProviderContractFields`, `enablePluginInConfig`, `resolveProviderWebSearchPluginConfig`, and scoped credential setters/getters |
diff --git a/docs/plugins/sdk-overview.md b/docs/plugins/sdk-overview.md
index 5ce0e772c..479a38213 100644
--- a/docs/plugins/sdk-overview.md
+++ b/docs/plugins/sdk-overview.md
@@ -137,7 +137,7 @@ explicitly promotes one as public.
     | `plugin-sdk/provider-auth` | `createProviderApiKeyAuthMethod`, `ensureApiKeyFromOptionEnvOrPrompt`, `upsertAuthProfile`, `upsertApiKeyProfile`, `writeOAuthCredentials` |
     | `plugin-sdk/provider-model-shared` | `ProviderReplayFamily`, `buildProviderReplayFamilyHooks`, `normalizeModelCompat`, shared replay-policy builders, provider-endpoint helpers, and model-id normalization helpers such as `normalizeNativeXaiModelId` |
     | `plugin-sdk/provider-catalog-shared` | `findCatalogTemplate`, `buildSingleProviderApiKeyCatalog`, `supportsNativeStreamingUsageCompat`, `applyProviderNativeStreamingUsageCompat` |
-    | `plugin-sdk/provider-http` | Generic provider HTTP/endpoint capability helpers |
+    | `plugin-sdk/provider-http` | Generic provider HTTP/endpoint capability helpers, including audio transcription multipart form helpers |
     | `plugin-sdk/provider-web-fetch-contract` | Narrow web-fetch config/selection contract helpers such as `enablePluginInConfig` and `WebFetchProviderPlugin` |
     | `plugin-sdk/provider-web-fetch` | Web-fetch provider registration/cache helpers |
     | `plugin-sdk/provider-web-search-config-contract` | Narrow web-search config/credential helpers for providers that do not need plugin-enable wiring |
diff --git a/docs/plugins/sdk-provider-plugins.md b/docs/plugins/sdk-provider-plugins.md
index 07d8d24f5..dcb7546ec 100644
--- a/docs/plugins/sdk-provider-plugins.md
+++ b/docs/plugins/sdk-provider-plugins.md
@@ -716,6 +716,17 @@ API key auth, and dynamic model resolution.
     as `maxInputImages`, `maxInputVideos`, and `maxDurationSeconds` are not
     enough to advertise transform-mode support or disabled modes cleanly.
 
+    Prefer the shared WebSocket helper for streaming STT providers. It keeps
+    proxy capture, reconnect backoff, close flushing, ready handshakes, audio
+    queueing, and close-event diagnostics consistent across providers while
+    leaving provider code responsible for only the upstream event mapping.
+
+    Batch STT providers that POST multipart audio should use
+    `buildAudioTranscriptionFormData(...)` from
+    `openclaw/plugin-sdk/provider-http` together with the provider HTTP request
+    helpers. The form helper normalizes upload filenames, including AAC uploads
+    that need an M4A-style filename for compatible transcription APIs.
+
     Music-generation providers should follow the same pattern:
     `generate` for prompt-only generation and `edit` for reference-image-based
     generation. Flat aggregate fields such as `maxInputImages`,
diff --git a/docs/plugins/voice-call.md b/docs/plugins/voice-call.md
index 331a5f9d9..13438d5ff 100644
--- a/docs/plugins/voice-call.md
+++ b/docs/plugins/voice-call.md
@@ -155,7 +155,8 @@ Current runtime behavior:
 
 - `streaming.provider` is optional. If unset, Voice Call uses the first
   registered realtime transcription provider.
-- Bundled realtime transcription providers include OpenAI (`openai`) and xAI
+- Bundled realtime transcription providers include Deepgram (`deepgram`),
+  ElevenLabs (`elevenlabs`), Mistral (`mistral`), OpenAI (`openai`), and xAI
   (`xai`), registered by their provider plugins.
 - Provider-owned raw config lives under `streaming.providers.<providerId>`.
 - If `streaming.provider` points at an unregistered provider, or no realtime