I DONOT THINK THAT THIS NOTIFICATION APPLICABLE IN UR CASE
ITS ONLY FOR UN AND THE LIKE
IF SERVICES RECEIVED FALL UNDER TAXABLE SERVICES UNDER SECTION 65 THEN REGISTRATION IS COMPULSORY
Notification No.16/2002-Service Tax
In exercise of the powers conferred by section 93 of the Finance Act, 1994 (32 of 1994), and in supersession of the notification of the Government of India, in the Ministry of Finance, Department of Revenue vide GSR 205(E), 24th April, 1998, the Central Government, being satisfied that it is necessary in the public interest so to do, hereby exempts all the taxable services specified in section 65 of the said Act provided by any person, to the United Nations or an International Organisation, from the whole of the service tax leviable under section 66 of the said Act.
EXPLANATION:- For the purposes of this notification, "International Organisation" means an international organisation declared by the Central Government in pursuance of section 3 of the United Nations (Privileges and Immunities) Act, 1947 (46 of 1947), to which the provisions of the Schedule to the said Act apply.