Problem

When sending voice notes via WhatsApp Web, using mimetype: "audio/ogg" doesn't work properly. WhatsApp requires the full codec specification "audio/ogg; codecs=opus" for voice notes to be recognized as playable PTT (push-to-talk) messages.

Affected files

• src/web/auto-reply.ts - when delivering auto-reply audio
• src/web/outbound.ts - when sending outbound audio via sendMessageWeb()

Proposed fix

When media.contentType === "audio/ogg", explicitly set the mimetype to "audio/ogg; codecs=opus":

const audioMimetype =
  media.contentType === "audio/ogg"
    ? "audio/ogg; codecs=opus"
    : media.contentType;