The EdgeMarc 4550 Series are flexible, application ready enterprise session border controllers that can be deployed nitially as a low-cost WAN access router and expanded to other application such as hosted VoIP, SIP trunking and enterprise video over IP. This model comes with 4 T1 ports enabled and up to 50 concurrent WAN calls enabled. -Enterprise-class session border controller optimized for medium to large offices-Connect to SIP Trunking and hosted IP telephony services-Protects voice devices by providing voice-aware security services-Optimizes voice quality using traffic management and prioritization-Manages the quality of real time communications to simplify troubleshooting-