Audio problems

Silence, choppy or delayed audio, echo, talking over the caller, and one-way sound on calls.

What you will achieve

You will identify whether an audio problem comes from the phone line, the speech services, or the agent's settings.

Test	If it is fine	If it is bad
Talk in the browser	The agent and voice work; look at the phone line	The agent or voice settings are the cause
A call from a mobile phone	The provider and agent work; look at the original caller's line	The phone side is the cause

Symptom	Likely cause	Fix
Nothing heard on the call, but the call is connected	A provider other than Twilio, or a very slow model or tool	Use Twilio; shorten tool time
The agent starts speaking late	Slow model or voice	Choose a faster model; use Cartesia (the fastest voice option)
Long pauses after the caller finishes	The agent waits to be sure the caller is done	Normal for a moment; a very long delay points to a slow tool or model
The agent talks over the caller	The caller was not heard in time	Check Speech recognition; callers on loudspeaker echo back into the line
Echo or feedback	The caller is on speakerphone	Ask them to use the handset or headset
Robotic or clipped audio	A poor mobile connection at the caller	Test from another phone or network
Only the opening line plays	The reply is failing after it	Open the call in History and check the transcript and tool results
Works in Talk, not on the phone	The phone leg	See Call connection failures

No sound in Talk. The browser asked for microphone access: allow it. Check the page is not muted and the right output device is chosen.
The microphone is not detected. Close other apps using it, then reload.

Say a long sentence, then a short one, then interrupt the agent. A healthy agent hears all three.

The agent speaks promptly, clearly, and stops when you talk over it.

Something here does not match what you see in the dashboard? Let us know.