Can we use SSML tags with TTS service other than 11labs.

clean-aquamarine · 2025-12-08T09:30:35.826Z

Please help me to know which other voice services will support ssml tags other than 11 labs.

V

Thank you for your question! While Vapi supports integration with multiple TTS providers and custom endpoints, the documentation does not specify which providers (besides 11labs) support SSML tags directly.

To help you further, could you specify which TTS provider(s) you are most interested in using with SSML support (e.g., Azure, PlayHT, Inworld, LMNT, OpenAI TTS)? This will help me provide more targeted information or guidance.

Reference: Vapi documentation on custom TTS and advanced features like SSML support (source)

Source:

Custom TTS Integration Vapi Documentation

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

C

clean-aquamarineOP•12/8/25, 9:34 AM

@Duckie I want to use Azure

V

Vapi Support BotAPP•12/8/25, 9:34 AM

Yes, you can use SSML tags with Azure TTS in Vapi.
To do this, simply include your SSML markup in the

text

text

text

text field when configuring your assistant's voice settings. For example:

{
  "voice": {
    "provider": "azure",
    "voiceId": "en-US-AriaNeural",
    "text": "<speak>Hello, <break time='500ms'/> how can I help you?</speak>"
  }
}

{
  "voice": {
    "provider": "azure",
    "voiceId": "en-US-AriaNeural",
    "text": "<speak>Hello, <break time='500ms'/> how can I help you?</speak>"
  }
}

{
  "voice": {
    "provider": "azure",
    "voiceId": "en-US-AriaNeural",
    "text": "<speak>Hello, <break time='500ms'/> how can I help you?</speak>"
  }
}

{
  "voice": {
    "provider": "azure",
    "voiceId": "en-US-AriaNeural",
    "text": "<speak>Hello, <break time='500ms'/> how can I help you?</speak>"
  }
}

Make sure your SSML is valid and supported by Azure's TTS engine for best results.
For more details, see the Azure provider documentation.

Sources:

Lltd-scarlet **Yes, you can use SSML tags with Azure TTS in Vapi.** To do this, simply incl...

C

clean-aquamarineOP•12/8/25, 11:30 AM

It's not working. The agent is speaking out <break time> . Please help us.

C

clean-aquamarineOP•12/9/25, 11:13 AM

@1231325148079194222 please help

V

VapiAPP•12/10/25, 6:06 AM

Hi, could you please provide a call id where you experienced this issue? We would like to review the logs to identify the cause.

Can we use SSML tags with TTS service other than 11labs.

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