4 digital signal processor / IP telephony / call admission control BAT BHCC branch office router / 20 2800 Series Routers / 3800 Series Routers / 1700 Series Routers / Quality of Service / WAN / access control list / IP telephony system / PSTN / wireless access / PBX / wireless devices / VPN / 2 encryption / 2 algorithm / ATM / 45 algorithms / Computer Telephony Integration / IP-to-IP / 4 Address Resolution Protocol / load balancing / DNS / video conferencing / MPLS / 20 Dynamic Host Configuration Protocol / H.323 / DSP / B-Channel / Web Server / Class of Service / /