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2.2.3.2.15.2 Requirements for Voice and Voicemail messages

  • Article

MIME readers should verify that MIME messages with a Content-Type header value of "missedcall", "voice-uc", "voice-ca", or "voice" have no attachments with a Content-Type header value that is not in the following list.

  • audio/gsm

  • audio/mp3

  • audio/wav

  • audio/wma