Interactive Intelligence has reported a revenue of $47.7m for the first quarter of 2011, an increase of 36% on a year-over-year basis compared to $35m in the same quarter previous year.

Product revenue was $20.8m, up 31.6% compared to $15.8m; recurring revenue was $20.7m, up 29.4% compared to $16m; and services revenue was $6.2m, up 88% compared to $3.3m for the first quarter of 2010.

For the quarter, operating income was $4.9m compared to operating income of $3.9m in the first quarter of 2010.

Net income for the first quarter of 2011 was $3.1m, or $0.16 per diluted share, compared to net income of $1.8m, or $0.10 per share in the first quarter of 2010.

Interactive Intelligence founder and CEO Donald Brown said they again saw strong year-over-year order increases across all major geographies and product groups.

"Total orders were up 55% over the first quarter of 2010, which included a near tripling in cloud-based contracts year-over-year," Brown said.

"We’re executing well on our sales and marketing plans and are benefiting from an increase in new opportunities as a result of our relationships with key strategic partners."