zammad/app/frontend/shared/entities/ticket-article/composables/channelIconsMap.json

{
  "chat": "chat",
  "email": "mail",
  "facebook": "facebook",
  "fax": "printer",
  "note": "note",
  "phone": "phone",
  "sms": "message",
  "telegram": "telegram",
  "twitter": "twitter",
  "web": "web",
  "whatsapp": "whatsapp"
}