The California-based firm, which has a large presence in Ottawa, posted US$409.2 million in GAAP revenues for the quarter ending March 31, compared with US$412.8 million last year.
On a non-GAAP basis, its revenues were $409.2 million, below a previous forecast of $410 million to $425 million in the quarter.
Net loss deepened to $17.4 million or eight cents a share, compared with $10.2 million or four cents a share in 2011.
"Although we saw lower than expected revenue in the quarter due to later than anticipated carrier orders and global macro-economic uncertainty, I am pleased with the progress we made on our strategic priorities and bottom line results," stated CEO Tom Waechter.
"Our focus on operational execution led to operating margins at the high end of our guidance ... Our differentiated products and solutions are well aligned with our customers' needs."
The company forecasts non-GAAP net revenue to be in the $415 million to $435 million range in Q4.