Communications software company Aricent has raised $4.7 million in a sale of regular shares to owners Kohlberg Kravis Roberts & Co. and Flextronics International, VentureBeat has learned.

The privately-held, Palo Alto, Calif.-based company says it offers everything from network infrastructure to end-user devices. Aricent has 350 customers worldwide, including Motorola, Nokia, Samsung, Sony Ericsson, Texas Instruments and Virgin Mobile. At the Mobile World Congress in Barcelona, Spain, the company announced today that it will be partnering with NetHawk to create new testing opportunities for communication equipment manufacturers.

Originally called Hughes Software Systems, Aricent was established in 1991. It was purchased by Flextronics in 2004, then by Kohlberg Kravis Roberts & Co. and Sequoia Capital in 2006, which is also when it was renamed Aricent.

I e-mailed an Aricent spokeswoman Friday for more information about the deal, but she said company executives were traveling and couldn’t be reached. (They’re probably in Barcelona.)