Azure Speech

Azure Speech is an Azure AI Speech text-to-speech provider. In OpenClaw it synthesizes outbound reply audio as MP3 by default, native Ogg/Opus for voice notes, and 8 kHz mulaw audio for telephony channels such as Voice Call.

OpenClaw uses the Azure Speech REST API directly with SSML and sends the provider-owned output format through X-Microsoft-OutputFormat.

Getting started

1. Create an Azure Speech resource

   In the Azure portal, create a Speech resource. Copy KEY 1 from Resource Management > Keys and Endpoint, and copy the resource location such as eastus.

   AZURE_SPEECH_KEY=<speech-resource-key>
   AZURE_SPEECH_REGION=eastus
   

2. Select Azure Speech in messages.tts

   {
     messages: {
       tts: {
         auto: "always",
         provider: "azure-speech",
         providers: {
           "azure-speech": {
             voice: "en-US-JennyNeural",
             lang: "en-US",
           },
         },
       },
     },
   }
   

3. Send a message

   Send a reply through any connected channel. OpenClaw synthesizes the audio with Azure Speech and delivers MP3 for standard audio, or Ogg/Opus when the channel expects a voice note.

Configuration options

Notes

Related