SUNNYVALE, Calif. -- NetScreen Technologies Inc. (Nasdaq: NSCN) today announced enhancements to the NetScreen-500 GPRS security system, enabling mobile network operators to strengthen security of their networks and the services provided to end customers.The enhancements include support for the newest GPRS Tunneling Protocol, GTP Release 1999, which is used to facilitate data roaming for wireless carrier networks. The NetScreen-500 GPRS is the industry's first security platform to support GTP Release 1997 and Release 1999, providing service providers a migration path to support GTP 1999 or enhance the security of their existing GPRS environments that already use GTP 1999.For business users relying on GPRS services for connecting to corporate resources, NetScreen added new Access Point Name (APN) filtering features. APN filtering provides mechanisms to ensure that only authorized users can gain access to specific mobile networks as well as corporate resources that may be connected via those mobile networks. The enhanced NetScreen-500 GPRS security system also includes support for dynamic routing protocols to ease network integration of the device and new high-availability capabilities to provide increased resiliency and uptime."Mobile networks are susceptible to many of the same security threats as traditional networks as well unique ones given the requirement to interconnect to other operator networks for roaming services," said David Flynn, vice president of marketing at NetScreen. "With the NetScreen-500 GPRS, not only are we increasing deployment flexibility for mobile operators, we're providing increased security functionality, allowing enterprise customers to more confidently leverage mobile network services for critical business applications." NetScreen Technologies Inc.