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CISCO3825-SRST/K9
3825 Voice Bundle w/ PVDM2-64,FL-SRST-175,SP Serv,128F/512D
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CISCO3825-SRST/K9 is a modular, enterprise-class router designed to deliver integrated services that include advanced voice, video, and data capabilities. It features flexible power options with an AC power supply and redundant configurations, robust WAN and LAN interfaces, and specialized VPN features to support secure remote connectivity.
CISCO3825-SRST/K9 offers a high-performance architecture with built-in integrated services and modular expansion slots that accommodate EHWIC modules, ensuring reliable throughput and redundancy. Designed for enterprise branch offices and remote sites, it effectively delivers secure VPN connectivity, quality of service, and voice fallback capabilities under SRST deployments.
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In a multi-site retail organization, CISCO3825-SRST/K9-3825 Voice Bundle w/ PVDM2-64, FL-SRST-175 and SP Serv is deployed at each remote branch. When the WAN link to the central CUCM fails, the FL-SRST-175 license automatically activates SRST mode on the 3825 router, leveraging the PVDM2-64 DSP modules and 128F/512D memory footprint to process up to 150 simultaneous voice calls locally. Benefit: Ensures uninterrupted customer service and voice continuity with 99.99% uptime despite central system outages.
A financial services firm facing strict regulatory uptime requirements configures CISCO3825-SRST/K9-3825 Voice Bundle as an on-premises voice gateway backup. In the event of a primary CUCM hardware failure, calls seamlessly fail over to the 3825 router’s SRST feature, supported by SP Serv integration for PSTN trunk re-registration and PVDM2-64 for high-quality media handling. Benefit: Zero voice downtime during core system outages, maintaining compliance and client trust.
A growing call-center operator with 120 concurrent agents and frequent multi-party conferences installs the CISCO3825-SRST/K9-3825 Voice Bundle w/ PVDM2-64. The router’s DSP resources enable hardware-accelerated transcoding and conferencing, while the 128F/512D capacity ensures seamless expansion. SP Serv licensing provides carrier integration for inbound/outbound calling. Benefit: Scalable, crystal-clear voice services that support business growth without forklift upgrades.
To get the detailed certification, please go to the Compliance Center.
| CISCO3825-SRST/K9 |  C3825-VSEC-CUBE/K9 |  CISCO3825-WAE/K9 |  CISCO3845-SEC/K9 |  CISCO3825-SEC/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Modular | Modular | Modular | Modular | Modular |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention | Firewall, Intrusion Prevention, VPN Encryption | Firewall / Intrusion Prevention / VPN |
| Compliance Standards | FCC / CE | FCC, CE | FCC / CE | FCC, CE, RoHS | FCC / CE |
| Connectivity Type | Wired | Wired | Wired / Wireless | Wired | Wired |
| Depth | N/A | 16 inches | N/A | N/A | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | EN 55022 | N/A | CISPR 22 | N/A |
| Ethernet Technology | 10/100 | 10/100/1000 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | EHWIC | NIM / EHWIC / SFP+ | EHWIC | NIM / EHWIC | EHWIC / NIM |
| Features | VPN / VoIP / IPv6 Compatible / Firewall | VPN / IPv6 Compatible / Firewall | VPN / Voice / Video / IPv6 Compatible / Firewall | VPN, VoIP, IPv6 Compatible, Firewall | VPN / Firewall / IPv6 Compatible / QoS |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 128 MB | 256 MB | 256 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | N/A | 4.5 inches | N/A | N/A | N/A |
| High Availability Support | Supported | Supported | Not Supported | Supported | Supported |
| Integrated Services | Voice / Video | Voice / Video / WAN Optimization | Voice / Video / Data | Voice, Video | Voice / Video / WAN Optimization |
| Interface Ports | RJ-45 | RJ-45 / SFP | RJ-45 / Serial | RJ-45 | RJ-45 |
| LAN Ports | 2 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | Modular LAN |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 256 MB | 512 MB | 256 MB | 512 MB | 256 MB |
| Modular Slots Available | 2 Slots | 2 Slots | 2 Slots | 2 Slots | 2 Slots |
| Network Protocols | IPv4 / IPv6 | IP, ICMP, TCP, UDP, RTP, SIP | TCP/IP / IPsec / HTTP / SNMP | TCP/IP, UDP, ICMP, IGMP | IPv4 / IPv6 |
| Power | 130 W | 250 W | 155 W | 415W | 375W |
| Power Source | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply | AC Power Supply / Redundant | AC Power Supply / Redundant |
| Product Name | CISCO3825-SRST/K9 | Cisco C3825 VSEC CUBE/K9 | CISCO3825-WAE/K9 | Cisco 3845 Integrated Services Router Security (CISCO3845-SEC/K9) | Cisco 3825 Security Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | Telnet / SSH / SNMP | SSH, Telnet, SNMP | CLI / SNMP | SSH, SNMP, Telnet | Telnet / SSH / SNMP / HTTP/HTTPS |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | UL, CSA | N/A | IEC/UL | N/A |
| Speed/Capacity | Fast Ethernet | Gigabit | N/A | 75 Mbps | Fast Ethernet |
| Stacking Capability | No | Yes | No | No | No |
| Telecom | N/A | RoHS Compliant | N/A | TIA/EIA | N/A |
| Throughput Capacity | 0.035 Gbps | 50 Mbps | 30 Mbps | 75 Mbps | 75 Mbps |
| Use Case | Enterprise | Enterprise | Enterprise | Enterprise | Enterprise |
| VPN Support | IPSec | IPSec / SSL VPN / DMVPN | IPSec | IPSec / SSL VPN | IPSec / SSL VPN |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | Modular WAN |
| Weight | N/A | 20 lbs | N/A | N/A | N/A |
| Wi-Fi Standard | N/A | N/A | 802.11 a/b/g | N/A | N/A |
| Width | N/A | 17 inches | N/A | N/A | N/A |
| Wireless Support | No | No | Yes | No | No |
Cisco 3825 SRST Voice Bundle ensures seamless voice continuity. PVDM2-64 with FL-SRST-175 maintains stable UC during network outages.
Durable and predictable. SRST support ensures uninterrupted voice services for branch offices.
Easy to deploy and manage. Maintains secure and reliable UC operations with minimal downtime.
Reliable Cisco solution. Supports multiple voice endpoints efficiently while maintaining SRST continuity.
Efficient and robust. Ideal for medium offices needing secure UC with SRST fallback.
The Cisco CISCO3825-SRST/K9 3825 Voice Bundle is a modular branch router pre-loaded with PVDM2-64 DSP resources, FL-SRST-175 survivable telephony licensing, service provider services, 128 MB flash, and 512 MB DRAM for voice and data integration.
It includes the PVDM2-64 digital signal processor module, supporting up to 64 voice channels for conferencing, transcoding, and media termination on Cisco ISR 3825 routers.
The FL-SRST-175 license enables Survivable Remote Site Telephony for up to 175 IP phones, ensuring uninterrupted call processing when connectivity to the central call manager is lost.
This bundle includes 512 MB of DRAM and 128 MB of onboard flash, providing sufficient capacity for voice images, call detail records, and configuration files.
With PVDM2-64 installed, the Cisco 3825 supports up to 64 concurrent voice or video calls, dependent on codec and feature usage.
The SP Serv package includes advanced routing protocols and QoS features optimized for service provider deployments, ensuring end-to-end voice quality and reliability.
Yes. You configure SRST by applying the FL-SRST-175 license, defining SRST parameters in Cisco Unified Communications Manager, and enabling SRST on the router’s voice ports.
The router supports G.711, G.729, G.726, G.722, and wideband audio codecs, allowing flexible bandwidth usage and high-quality voice calls.
Yes. You can upgrade PVDM or add flash and DRAM modules to expand voice capacity, and activate additional feature licenses as your network demands grow.
Open the top chassis cover, install Cisco-approved DRAM and flash modules in the designated slots, then verify module detection in the router CLI.
It’s ideal for enterprise branch offices requiring integrated voice/data routing, remote survivability, secure VPN connectivity, and service provider aggregation.
The ISR 3825 supports Cisco redundant power supplies and can leverage Cisco IOS® features like HSRP or VRRP for network-level resiliency.
Standard Cisco one-year hardware warranty applies, with optional Cisco SMARTnet® for 24×7 support, advance replacement, and software updates.
Use the CLI command 'show diag | include PVDM2' or 'show platform hardware qfp active feature’ to confirm DSP installation and operational status.
Cisco has announced the ISR 3825 will be superseded by newer ISR models; check Cisco’s EoL bulletin for precise dates and recommended replacements.
Purchase and install the next tier FL-SRST license (e.g., FL-SRST-300) and apply the new license file through the Cisco IOS CLI to increase supported phones.
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