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"Voice output stopped working after VAPI update - GPT-4o Mini Realtime + Chinese prompts"

Hello VAPI community!
I'm experiencing an issue where my voice assistant has stopped producing audio output after a recent VAPI platform update. The same configuration was working perfectly before.
Current Setup:

Model: OpenAI GPT-4o Mini Realtime Cluster
Voice Provider: OpenAI
Voice: Echo
TTS Model: GPT-4o mini tts
Language: Chinese prompts/responses

Problem:
Previously: Everything worked normally with voice output
After VAPI update: No voice output during testing (assistant responds but silent)
OpenAI credits: Sufficient balance confirmed

What I've tried:
Verified OpenAI account has adequate credits
Confirmed same settings that previously worked
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