The Cisco 3925 Integrated Services Router (ISR) delivers highly secure data, voice, video, and application services to small branch offices. Key features include: - Modular Services Performance Engine (SPE) 100, which can be upgraded for even higher performance as next-generation WAN environments evolve - 3 integrated 10/100/1000 Ethernet ports with 2 ports capable of RJ-45 or SFP connectivity - 2 service module slots - 4 Enhanced High-Speed WAN Interface Card (EHWIC) slots - 4 onboard digital signal processor (DSP) slots - 1 Internal Services Module slot - Dual integrated power supplies - Fully integrated power distribution to modules supporting 802.3af Power over Ethernet - A universal IOS image that lets you deploy new IOS services quickly Security - Embedded hardware-accelerated VPN encryption for secure collaboration - Integrated threat control using Cisco IOS Firewall, Cisco IOS Zone-Based Firewall, Cisco IOS IPS, and Cisco IOS Content Filtering - Identity management using authentication, authorization, and accounting (AAA) and public key infrastructure Unified Communications - High-density-packet voice DSP module, optimized for voice and video support - Standards-certified VoiceXML browser services - Cisco Unified Border Element capabilities for up to 800 sessions - Cisco Unity Express voicemail support - Support for Cisco Communications Manager Express and Survivable Remote Site Telephony