NTT West Corp. is considering integrating and consolidating its 30 branch offices to between 10 and 15 in a bid to streamline operations, cut costs and weather intensifying competition, company sources said Saturday.

NTT West, one of the two local phone operators of Nippon Telegraph and Telephone Corp., is likely to begin negotiations with its labor union soon to work out details, the sources told Kyodo News.

The development comes after NTT West suffered a pretax loss of 105.7 billion yen in the business year that ended March 31, and recognized the need for additional cost-cutting measures, they said.