Yeah, I can help with that. If the call is starting but you’re not hearing anything, it’s usually an audio output issue on the Pi (ALSA/PulseAudio config, wrong output device, or the stream not being routed to your speaker). It could also be that the audio stream from the Retell agent isn’t being properly consumed or played in your Python code. Quick question: are you able to play any normal audio on the Pi through that speaker outside of your script?