For the second time in four years, BlackBerry faces sanctions from the government of Indonesia, one of the smartphone maker's most important markets.

Indonesia's ministry of communications and information technology announced it was preparing sanctions against the Canadian company after a service disruption blocked access to BlackBerry Messenger for an estimated 6.3 million subscribers. The July outage was the fourth for BlackBerry's Indonesian users since April 2012.

In 2009, the government imposed a two-month freeze on new BlackBerry licences because the company had not opened a local branch office with after-sale services.

Indonesia, which is the world's fourth most populous country, is a cornerstone of BlackBerry's global subscriber base of 72 million.