Rafael
01/28/2026, 7:47 PMChiranjeet Mishra
01/31/2026, 1:06 AMfirstMessageMode: "assistant-waits-for-user" so the assistant stays silent and lets the voicemail greeting play uninterrupted.
This allows voicemail to be detected faster, the call to hang up immediately, and also reduces TTS costs since no speech is generated and cut off.
This setup is typically the fastest and most cost-efficient approach for voicemail-heavy outbound calling.
Best,
Kyle