code: public void billingAccount_trunk_serviceName_externalDisplayedNumber_number_DELETE(String billingAccount, String serviceName, String number) throws IOException {
  		String qPath = "/telephony/{billingAccount}/trunk/{serviceName}/externalDisplayedNumber/{number}";
  		StringBuilder sb = path(qPath, billingAccount, serviceName, number);
  		exec(qPath, "DELETE", sb.toString(), null);
  	}
docs: Delete an external displayed number for a given trunk
  
  REST: DELETE /telephony/{billingAccount}/trunk/{serviceName}/externalDisplayedNumber/{number}
  @param billingAccount [required] The name of your billingAccount
  @param serviceName [required] Name of the service
  @param number [required] External displayed number linked to a trunk