Voicemail encoding

I have a problem with the encoding of emails in fr_FR.utf8.

Extension Welcome Email, Emergency Notification Email and Tenant Welcome Email are ok.

Only New Voicemail Email is problematic.

  • voicemail__10-general.conf contains locale=fr_FR.utf8 and charset=UTF-8
  • sending emails with sendmail in console is ok
  • the subject of the mail New Voicemail Email is ok
  • the content of the message is not encoded correctly

Does anyone have a solution to this problem?
Thank you