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making voice paging and notification announcements easier to understand
IPv6 routing included in the IP Services feature set
Enterprise-class silicon and optimized radios deliver a robust mobility experience using Cisco M-Drive technology
16-Line Operation
Four soft keys for screen-based applications
Cisco 4221 ISR Router - ISR4221/K9 3750 making voice paging and notificationNew and Refurbished 4221 ISR with 3 onboard GE, 2 NIM slots, 1 ISC slot, 1 SM slot, 4 GB flash memory default, 4 GB DRAM default with Warranty The Cisco 4000 Series Integrated Services Routers (ISR) revolutionize WAN communications in the enterprise branch. With new levels of built in intelligent network capabilities and convergence, the routers specifically address the growing need for application aware networking in distributed enterprise sites.