Covering Letter on the company letterhead in detail mentioning the designation of the traveller, travel dates and the name, designation of authorised signatory(NOTE PASSENGER CAN’T SIGN THE LETTER ).
Invitation Letter to be faxed directly from Bangladesh with fax no visible on it. The Invitation should also have name and designation of the authorised singnatory along with the complete address and contact numbers of Bangladeshi Company.
Chamber letter of Indian Company OR Company registration.