docs: complete voice mode docs

website/docs/user-guide/messaging/telegram.md

@@ -131,7 +131,11 @@ Group chat IDs are negative numbers (e.g., `-1001234567890`). Your personal DM c
 
 ### Incoming Voice (Speech-to-Text)
 
-Voice messages you send on Telegram are automatically transcribed using OpenAI's Whisper API and injected as text into the conversation. This requires `VOICE_TOOLS_OPENAI_KEY` in `~/.hermes/.env`.
+Voice messages you send on Telegram are automatically transcribed by Hermes's configured STT provider and injected as text into the conversation.
+
+- `local` uses `faster-whisper` on the machine running Hermes — no API key required
+- `groq` uses Groq Whisper and requires `GROQ_API_KEY`
+- `openai` uses OpenAI Whisper and requires `VOICE_TOOLS_OPENAI_KEY`
 
 ### Outgoing Voice (Text-to-Speech)
 
@@ -173,7 +177,7 @@ Hermes Agent works in Telegram group chats with a few considerations:
 | Bot not responding at all | Verify `TELEGRAM_BOT_TOKEN` is correct. Check `hermes gateway` logs for errors. |
 | Bot responds with "unauthorized" | Your user ID is not in `TELEGRAM_ALLOWED_USERS`. Double-check with @userinfobot. |
 | Bot ignores group messages | Privacy mode is likely on. Disable it (Step 3) or make the bot a group admin. **Remember to remove and re-add the bot after changing privacy.** |
-| Voice messages not transcribed | Check that `VOICE_TOOLS_OPENAI_KEY` is set and valid in `~/.hermes/.env`. |
+| Voice messages not transcribed | Verify STT is available: install `faster-whisper` for local transcription, or set `GROQ_API_KEY` / `VOICE_TOOLS_OPENAI_KEY` in `~/.hermes/.env`. |
 | Voice replies are files, not bubbles | Install `ffmpeg` (needed for Edge TTS Opus conversion). |
 | Bot token revoked/invalid | Generate a new token via `/revoke` then `/newbot` or `/token` in BotFather. Update your `.env` file. |