Passports at least have a validity of six months and at least two blank pages.
2 Recent photographs (size of 35-40 mm, white background).
Covering Letter on company's letter head with company seal and sign.
Recommendation letter from Indian Chamber of Commerce.
The sponsor you intent to visit in the Sudan should obtain approval from the Ministry of Interior and then send it to the Ministry of External Affairs of the Sudan, who in turn will fax the same direct to the Embassy.