Nokia uses a Linux solution for it’s telecom needs

Nokia has selected Red Hat Enterprise Linux as its primary operating
system for carrier-grade server platforms. Red Hat will provide Nokia
with onsite consulting, support, certification and training services,
and will be tightly integrated with Nokia’s technical team for
telecommunications solutions development.

"The
Red Hat Enterprise Linux platform has long been known for high levels
of reliability and availability in situations where downtime is not an
option. Working with Nokia, we plan to make our solution for the
telecommunications industry even stronger," said Paul Cormier,
executive vice president of Engineering, Red Hat.

Source: SDA India

Something tells me when I go to CES in January that I’ll be hearing a lot about the VOIP features of Windows Vista.