Telecoms gear maker Nokia Siemens Networks (NSN) narrowly overtook bigger rival Ericsson by revenue in the Indian market in the year to March, a survey by an industry journal showed, although all the leading gear makers were hit by security concerns raised by the Indian government.

Companies in India won third-generation spectrum in an auction last year and have started rolling out 3G networks in recent months.

But India''s tightening of telecoms gear rules last year over security concerns prohibited telecoms carriers to release network expansion orders, hitting gear makers' revenue, the survey by telecoms industry journal Voice&Data showed.

Ericsson, the world's top mobile network equipment maker, saw its India revenue falling 29.4 percent to 61.73 billion rupees ($1.4 billion) in the 2010/11 fiscal year to end-March, while that of Nokia Siemens Networks' dropped 5 percent to 61.77 billion rupees, the survey said.

Chinese gear makers Huawei and ZTE, which were barred for several months last year from supplying telecoms equipment to India, saw their India revenue falling 23.5 per cent and 12.8 per cent, respectively, the survey said.

Huawei generated India revenue of 56.88 billion rupees, while ZTE had 41.18 billion rupees, the survey, which is based on data collected from the industry, showed.

Companies usually do not disclose India-specific revenue figures.

Among others, Nokia, the world's top handset maker, grew its India revenue by 0.2 per cent to 129.29 billion rupees, while U.S. firm Cisco Systems saw its revenue from the country rising nearly 30 percent to 70.1 billion rupees, the survey showed.