aivini
10/14/2025, 3:06 PMVapi Support Bot
10/14/2025, 3:08 PMfirstMessage and that your TTS endpoint is ready to handle requests immediately when the call starts. You can add logging to your TTS endpoint to confirm if the request is being received:
js
app.use('/api/synthesize', (req, res, next) => {
console.log('=== Incoming TTS Request ===');
console.log('Headers:', req.headers);
console.log('Body:', JSON.stringify(req.body, null, 2));
next();
});
If you do not see a request for the first message, review your assistant's configuration for any missing or misconfigured fields.
For more details, see the [Vapi custom TTS troubleshooting guide](https://docs.vapi.ai/customization/custom-voices/custom-tts).
Source:
- [Vapi Custom TTS Integration Guide](https://docs.vapi.ai/customization/custom-voices/custom-tts)Chiranjeet Mishra
10/16/2025, 8:06 AMaivini
10/16/2025, 8:08 AMaivini
10/16/2025, 8:08 AMChiranjeet Mishra
10/20/2025, 6:01 AM