call id: 2a206378-aa7f-48e5-a46c-a4ed9947accc transcript: AI: I was able to find an account matching the phone number you're calling from. For security purposes, can you verify the last 4 digits of your Social Security number? User: 1 2 3 4. AI: Poor favor, DiGielo and Pas Mientras Verifi Iso. In above transcript you see, AI is responding in spanish all of a sudden. Even thought we addd prompt to respond only with english. Emotion Detection: off Backchanneling Enabled: off

Hi there! I understand how frustrating it can be when your AI assistant suddenly switches languages mid-conversation. I'm unable to determine the exact cause for this specific call without seeing your complete configuration, but I can definitely help explain potential reasons for this issue and provide troubleshooting steps. Based on the information I found, there are several possible reasons why your AI might have unexpectedly responded in Spanish: ## Potential Causes 1. **Configuration Issues**: There might be a configuration issue with the language detection or language models being used. According to [troubleshooting documentation](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1328595920899674152), incorrect language settings in either the transcriber or voice model configurations can cause unexpected language switching. 2. **System Prompt Conflict**: Your system prompt might contain conflicting instructions about language use. As noted in [language prompt configuration](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1333350360932421682), if there are instructions in the system prompt that mention Spanish or language conversion, this could override your English-only instruction. 3. **Transcriber Language Settings**: The language setting for the transcriber might not be explicitly set to English. According to [Vapi language settings](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1331035264751112202), you need to ensure the transcriber language is properly configured. 4. **Model Switching**: The system might have switched models during the conversation due to response time issues, and the fallback model might be configured differently. [Troubleshooting documentation](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1323288623629471866) suggests checking call logs to see if model switching occurred. ## Troubleshooting Steps

@Vapi it is set as

en

all settings seems to be fine.

🔵 19:44:14:303 Voice Input Formatted: "Por favor, déjelo en paz mientras verifico eso.", Original: "Por favor, déjelo en paz mientras verifico eso." 🔵 19:44:14:301 Successfully Translated

Please give me a moment while I verify that.

to `es`:

Por favor, déjelo en paz mientras verifico eso.

Hey Stardust, it's a complete mistake where mistakenly convert your content into Spanish (ES) language, which it was not supposed to be. Do you have any other call IDs where this behavior is being repeated as well?

@Shubham Bajaj yes check this, this time it seems to be french. call id: a06901ef-4150-4028-ac54-ec4559a71929 at 0:39 in audio. transcript: 18:08:42:899 [LOG] Voice input: Sérinez-moi un moment pour que je vérifie que. Why there is so many inconsistencies like this? We cannnot go production live with this. @Vapi We are blocked. Some one from your end need to look into this ASAP.

@stardust I've identified that the issue occurs because the tool messages are using the

contents

property, which is specifically designed for multilingual support. Here's what's happening: 1. Your tool call includes messages with the

contents

property containing English text 2. The system has French (

fr

) set as the

activeLanguage

3. The

contents

property triggers the automatic translation mechanism 4. Since no French content is found in the array, it translates the English content to French 5. The translated French text is then sent to the speech generation service ## Solution: Use

content

Instead of

contents

Yes, using the

content

property instead of

contents

will resolve this issue. When you use the

content

property: 1. It bypasses the multilingual content handling logic 2. The text will be used as-is without automatic translation 3. Your English content will remain English regardless of the active language setting ### Implementation: Change your tool message format from:

javascript
"messages": [
  {
    "type": "request-start",
    "contents": [
      {
        "type": "text",
        "text": "Please give me a moment while I verify that.",
        "language": "en"
      },
      {
        "type": "text",
        "text": "Just a moment while I verify that",
        "language": "en"
      }
    ],
    "conditions": [],
    "blocking": false
  }
]

To:

javascript
"messages": [
  {
    "type": "request-start",
    "content": "Please give me a moment while I verify that.",
    "conditions": [],
    "blocking": false
  }
]

This change will ensure your content remains in its original language and won't be automatically translated to French or any other active language in the system.

but i have "language": "en" for english for each content.

Hi, checking if this is resolved/solved for you?