Cisco C3925-CME-SRST/K9
3925 Voice Bundle w/ PVDM3-64
Product Highlights
What's Included
256MB Flash (1x MEM-CF-256MB)
(1) PWR-3900-AC
(1) AC Power Cord
(1) Rackmount Kit (ACS-3900-RM-19)
(1) PVDM3-64
Branch offices need a single platform that consolidates routing, security, and voice services without the complexity and cost of managing multiple appliances. The Cisco C3925-CME-SRST/K9 is a purpose-built voice bundle based on the Cisco 3925 Integrated Services Router (ISR G2), pre-configured with the PVDM3-64 digital signal processor, FL-CME-SRST-25 feature license, and a UC License PAK — everything required to deploy unified communications at a medium-to-large branch site.
As part of the Cisco 3900 Series, the C3925-CME-SRST/K9 delivers highly secure data, voice, video, and application services through a modular architecture that supports a wide range of wired and wireless connectivity options including T1/E1, T3/E3, xDSL, copper, and fiber Gigabit Ethernet. The platform features embedded hardware encryption acceleration, intrusion prevention capabilities, and rich QoS — enabling concurrent services without compromising throughput.
With 1 GB of DRAM, 256 MB of compact flash, and extensive expansion via 4 EHWIC slots, 4 DSP slots, 1 ISM slot, and 2 service module slots, this router is built to scale as your branch requirements evolve. The included rackmount kit and AC power supply make it ready for immediate deployment in standard 19-inch racks. For organizations seeking a consolidated branch-office platform that reduces capital expenditure while delivering enterprise-grade voice and data services, the C3925-CME-SRST/K9 is a proven, cost-effective solution.
Features & Benefits
Integrated Voice & Unified Communications
The bundled PVDM3-64 provides 64 channels of high-density DSP resources for voice transcoding, conferencing, and media processing. Combined with the FL-CME-SRST-25 license and UC License PAK, the router supports Cisco Unified Communications Manager Express (CME) and Survivable Remote Site Telephony (SRST) right out of the box — eliminating the need to purchase DSP modules and voice licenses separately.
Modular, Future-Ready Architecture
The Cisco 3925 platform offers 4 EHWIC slots, 4 DSP slots, 1 ISM slot, and 2 service module slots, providing extensive room for WAN interface cards, additional DSPs, and service modules. This modular design lets you add capabilities — such as additional voice channels, WAN links, or application services — as your branch grows, protecting your initial investment.
Enterprise-Grade Security
Embedded hardware encryption acceleration supports high-performance IPsec VPN tunnels without dedicated security appliances. Optional firewall and intrusion prevention system (IPS) capabilities can be activated via software licensing on the universal IOS image, consolidating your security stack into a single managed device.
High-Performance Routing
With 3 onboard Gigabit Ethernet ports, 1 GB of DRAM, and the Services Performance Engine (SPE) 100, the Cisco 3925 is engineered for demanding branch environments. It supports advanced routing protocols including BGP, EIGRP, OSPF, and IS-IS, along with MPLS and IPv6, ensuring compatibility with modern enterprise network designs.
Simplified Software Licensing
The Cisco ISR G2 ships with a universal IOS image that contains all technology sets, activatable via software license keys. This means you can enable advanced features — such as security, application visibility, or additional UC capabilities — without downloading and installing a new IOS image, reducing downtime and operational overhead.
Deployment Scenarios
Medium Branch Office Voice Gateway
Deploy the C3925-CME-SRST/K9 as a combined WAN router and voice gateway at a branch with up to 25 IP phone users. The included PVDM3-64 handles transcoding and conferencing locally, while CME provides call processing and SRST ensures telephony survivability if the WAN link to the headquarters call manager goes down.
Multi-Service Branch Consolidation
Replace separate routing, firewall, and voice appliances with a single Cisco 3925 platform. The modular slot density allows you to add WAN interfaces, wireless controllers, and application service modules over time — reducing rack space, power consumption, and management complexity at remote sites.
SRST Failover for Cisco Unified Communications Manager
Position the C3925-CME-SRST/K9 at branch locations registered to a centralized Cisco Unified Communications Manager (CUCM) cluster. In the event of a WAN outage, the router automatically provides SRST fallback call processing, ensuring that branch users retain basic telephony services until connectivity is restored.
General
Interfaces & Expansion
Memory
Voice & DSP
Routing & Protocols
Network Standards
Power
Physical
Environmental & Compliance
Compatibility Notes
Platform: Cisco 3900 Series ISR G2 (Model: C3900 / Cisco 3925 chassis)
Included DSP: PVDM3-64 — compatible with Cisco 3900, 2900, and 3800 series routers that support PVDM3 modules.
Memory: Ships with 1 GB DRAM (MEM-3900-1GB) and 256 MB Compact Flash (MEM-CF-256MB). The Cisco 3925 supports up to 2 GB DRAM and up to 4 GB Compact Flash.
Power Supply: Includes one PWR-3900-AC power supply. The chassis supports dual redundant AC power supplies.
Rackmount: Includes ACS-3900-RM-19 kit for standard 19-inch rack installation (3U height).
Software: Cisco IOS universal image (IP Base). Advanced feature sets (Security, UC, Data, etc.) are activatable via license keys.
Downloads & Resources
Frequently Asked Questions
| Part Number | Product | Key Difference |
|---|---|---|
| CISCO3925/K9 | Cisco 3925 Base Router (IP Base) | Base router without PVDM3-64 DSP, CME/SRST license, or UC License PAK — choose if you don't need voice capabilities. |
| CISCO3925-V/K9 | Cisco 3925 Voice Bundle | Voice bundle with PVDM3-64 but without the FL-CME-SRST-25 and UC License PAK included in the CME-SRST bundle. |
| C3925E-CME-SRST/K9 | Cisco 3925E Voice Bundle (Enhanced) | Enhanced 3925E platform with SPE200, 4 onboard GE ports, and 3 EHWIC slots — higher performance for larger branches. |
| C3945-CME-SRST/K9 | Cisco 3945 Voice Bundle | Higher-density 3945 chassis with 4 SM slots and SPE150 — ideal when you need more service module capacity. |