Hi Anawat
Attached please find the letter of support for your visa application for Australia.
I have been informed that you will require a Class 400 visa as the nature of the trip has been deemed to be working in Australia as you are presenting and meeting with the customer. This is due to the fact that Siemens will have a signed contract to perform the work.
Please let me know if we can provide any further assistance.
Would you please kindly support me if I require another type of visa as instruct by Siemens Australia