code: public Long billingAccount_voicemail_serviceName_greetings_POST(String billingAccount, String serviceName, OvhVoicemailMessageFolderGreetingEnum dir, String documentId) throws IOException {
  		String qPath = "/telephony/{billingAccount}/voicemail/{serviceName}/greetings";
  		StringBuilder sb = path(qPath, billingAccount, serviceName);
  		HashMap<String, Object>o = new HashMap<String, Object>();
  		addBody(o, "dir", dir);
  		addBody(o, "documentId", documentId);
  		String resp = exec(qPath, "POST", sb.toString(), o);
  		return convertTo(resp, Long.class);
  	}
docs: Upload a new sound for a specific greeting. Return a task id.
  
  REST: POST /telephony/{billingAccount}/voicemail/{serviceName}/greetings
  @param dir [required] Greeting voicemail directory
  @param documentId [required] Get the /me/document uuid generated
  @param billingAccount [required] The name of your billingAccount
  @param serviceName [required]