VAPI•8mo ago

Unexpected User Speech during User Silence

Hello,

I am experiencing a strange behaviour during calls.
I noticed that the Agent at some point stop talking and start the sentence from scratch. Looks like that the agent thinks that it's interrupted by user, but it's not.

Moreover, i checked the transcription and i can get confirmation of that, since i can see strange sentences like "go to home page" or "use the one on bottom right" that it's present as user speech, but the user never said (he was silent).

How can i prevent this issue?

As an example, below the info of a call with this problem:
Call-id: 9b7adb80-2662-45b7-8c63-c5c1424f125f
first repetition time -> 1:26
secondo repetition time -> 3:07

Vapi Support BotAPP•5/2/25, 1:13 PM

To prevent false speech detection during silence, adjust your speech detection thresholds:

{
  "machineDetectionSpeechThreshold": 3000,
  "machineDetectionSpeechEndThreshold": 2000,
  "machineDetectionSilenceTimeout": 7000
}

{
  "machineDetectionSpeechThreshold": 3000,
  "machineDetectionSpeechEndThreshold": 2000,
  "machineDetectionSilenceTimeout": 7000
}

These higher values will make the system less sensitive to background noise that might be misinterpreted as speech.

Sources:

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

spontaneous-moccasinOP•5/2/25, 1:17 PM

@Duckie Looks like the sources you identified are referring voicemail detection, but that's not my case. my problem is happening on a call with a human. is it relevant as well your last suggestion?

Vapi Support BotAPP•5/2/25, 1:18 PM

Yes, these machine detection parameters are relevant for your human call issue. While primarily used for voicemail detection, they affect how Vapi interprets speech and silence in all calls, including human conversations.

The higher threshold values I suggested would make the system less sensitive to background noise that might be misinterpreted as speech during silence.

Are you experiencing any specific background noise or audio quality issues during these calls that might be triggering the false speech detection?

Sources:

spontaneous-moccasinOP•5/2/25, 1:21 PM

No, looks like there wasn't noise

VapiAPP•5/2/25, 9:16 PM

Hey, as you can see from the screenshot, what Transcriber is outputting, I want to know what else was expected in place of "Vai alla pagina iniziale" to understand this was expected to be transcribed, but instead, it was transcribed with this "Vai alla pagina iniziale". I can then take this to the transcription service provider.

spontaneous-moccasinOP•5/6/25, 7:37 PM

hey @Shubham Bajaj, the problem is that nothing was expected because the other party wasn't speaking at all

dangerous-fuchsia•5/9/25, 1:11 AM

@g123 Do you have other call IDs with similar issues? More call IDs will help me identify patterns and find the possible calls for a fix.

Unexpected User Speech during User Silence

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