The Cisco VPN 3015 Concentrator is designed for small to medium sized businesses that require full duplex T1/E1. The VPN 3015 delivers a maximum of 100 simultaneous IP security sessions or 75 simultaneous clientless sessions. The Cisco VPN 3015 is easily upgradeable to the Cisco VPN 3030 and 3060 models. Frontier offers used and refurbished VPN 3015s. Call Frontier today or simply request a quote. 866-226-6344