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C888SRST-K9
Cisco SRST888 G.SHDSL / FXS / BRI / Sec Router
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C888SRST-K9 is a fixed integrated services router designed for secure and reliable connectivity at remote sites and branch offices. It features efficient AC power options, dual WAN interfaces, and four LAN ports, all built into a compact chassis while delivering integrated services such as voice and video, alongside advanced firewall and VPN capabilities.
C888SRST-K9 offers robust VPN support including IPSec and SSL VPN to secure data communications with high throughput and low latency. Its architecture provides internal redundancy and supports essential QoS features along with integrated security, making it ideally suited for business and enterprise use cases requiring survivable remote site telephony and seamless connectivity.
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In a multi-location retail chain, the C888SRST-K9 delivers automatic Site Resilient Transport (SRT) using G.SHDSL to maintain connectivity when MPLS or broadband links fail. By switching to the built-in G.SHDSL interface and integrated VPN security, branch offices stay online for critical POS transactions and real-time inventory updates. Outcome: near-zero downtime, uninterrupted sales processing, and consistent customer experience.
A financial services firm uses C888SRST-K9 to provide Cisco SRST fallback for its Cisco Unified Communications Manager. When the primary WAN link or call manager goes offline, FXS ports on the SRST888 instantly register IP phones and restore dial tone over a secure VPN. Outcome: uninterrupted voice service, compliance with internal SLAs, and protection of sensitive financial conversations.
In a remote manufacturing plant lacking fiber access, the C888SRST-K9 combines G.SHDSL bonding and ISDN BRI to deliver high-speed data, secure VPN, and legacy voice over FXS. The integrated firewall and IPsec encryption secure PLC telemetry and voice communications back to headquarters. Outcome: cost-effective rural connectivity, consolidated services on a single platform, and robust data security.
To get the detailed certification, please go to the Compliance Center.
| C888SRST-K9 |  CISCO881W-GN-A-K9 |  CISCO851W-G-A-K9 |  CISCO891-K9 |  CISCO876W-G-E-K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Fixed | Fixed | Fixed |
| Broadband | N/A | N/A | DSL / Cable / N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall, Intrusion Prevention, Malware Protection | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention |
| Compliance Standards | FCC, CE, UL | FCC, IC | IEEE 802.3, IEEE 802.11b/g | FCC, CE | FCC, CE, RoHS |
| Connectivity Type | Wired | Wired / Wireless / Ethernet | Wired / Wireless | Wired | Wired / Wireless |
| Depth | 7.5 inches | 11 inches | N/A | 9.06 inches | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | N/A | N/A | N/A | N/A |
| Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | N/A | N/A | N/A | EHWIC | N/A |
| Features | VPN / VoIP / IPv6 Compatible / Firewall | VPN / VoIP / IPv6 Compatible / Firewall | VPN, Firewall, Integrated Wireless, VoIP | VPN / IPv6 Compatible / Firewall | VPN / IPv6 Compatible / Firewall |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 128 MB | 128 MB | 128 MB | 256 MB | 128 MB |
| Form Factor | Rack-mount | Desktop | Desktop | Desktop | Desktop |
| Height | 1.1 inches | 1.8 inches | N/A | 1.73 inches | N/A |
| High Availability Support | Supported | Not Supported | Supported | Supported | Not Supported |
| Integrated Services | Voice / Video | Voice / Video / WAN Optimization | Voice, Video, WAN Optimization | Voice / Video | Voice |
| Interface Ports | RJ-45 / SFP | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 512 MB | 256 MB | 512 MB | 256 MB |
| Modular Slots Available | N/A | N/A | N/A | 1 Slot | N/A |
| Network Protocols | IP, PPP, Frame Relay, MLPPP | IPv4, IPv6, HTTP, HTTPS, SSH, SNMP | TCP/IP, UDP, ICMP | IPv4 / IPv6 | IPv4, IPv6 |
| Power | 45W | 24W | 65 Watt | 25 Watt | 24W |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply / DC Power Supply / Redundant | AC Power Supply | DC Power Supply |
| Product Name | Cisco C888SRST-K9 | CISCO881W-GN-A-K9 Integrated Services Router | CISCO851W-G-A-K9 | CISCO891-K9 Integrated Services Router | Cisco 876 Wireless Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Integrated Services Router | Integrated Services Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | Telnet, SSH, SNMP | Telnet / SSH / HTTP/HTTPS | Telnet, SSH, SNMP | CLI / Web-based | HTTP, HTTPS, Telnet, SSH, SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / Static Routing | OSPF / RIP / Static Routing | RIP / OSPF / EIGRP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | N/A | N/A | 100 Mbps | Gigabit | N/A |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 0.15 Gbps | 50 Mbps | 100 Mbps | 0.1 Gbps | 20 Mbps |
| Use Case | Business | Small Business / Enterprise | Enterprise / Small Business | Business | Small Business |
| VPN Support | IPSec / SSL VPN / DMVPN / N/A | IPSec / SSL VPN / DMVPN / N/A | IPSec | IPSec / SSL VPN / DMVPN | IPSec |
| WAN Configuration | Dual WAN | WAN | WAN | Dual WAN | WAN |
| WAN Ports | 2 WAN | 1 WAN | 1 WAN | 1 WAN | 1 WAN |
| Weight | 5.5 lbs | 6 lbs | N/A | 8.96 lbs | N/A |
| Wi-Fi Standard | N/A | WiFi 4 | WiFi 4 (802.11g) | N/A | WiFi 3 |
| Width | 8.8 inches | 15 inches | N/A | 8.27 inches | N/A |
| Wireless Support | No | Yes | Yes | No | Yes |
The Cisco C888SRST-K9 is an excellent router for secure, reliable voice and data communications. It supports G.SHDSL and FXS with great ease.
Reliable and secure router for remote office connectivity. The C888SRST-K9 supports multiple WAN options and ensures stable, high-quality voice services.
The C888SRST-K9 is perfect for hybrid voice and data needs. It offers secure and stable routing with robust support for multiple communication protocols.
Stable and secure. The Cisco C888SRST-K9 is a great solution for integrating voice and data services in remote office environments.
C888SRST-K9 is a perfect choice for voice-enabled WAN setups. It provides seamless connectivity and integrates well with various legacy systems.
The Cisco SRST888 (C888SRST-K9) is a secure branch router offering G.SHDSL WAN, FXS/BRI voice ports, and integrated security for reliable failover and IP telephony continuity.
Cisco SRST888 provides Survivable Remote Site Telephony (SRST) by locally routing voice calls over FXS/BRI ports when the primary call manager is unreachable.
The SRST888 supports dual G.SHDSL interfaces delivering up to 15.3 Mbps symmetrical bandwidth for robust, cost-effective broadband connectivity.
This router features eight FXS ports for analog phones and two BRI S/T ports for ISDN voice or data connectivity.
Yes. It includes integrated stateful firewall, VPN (IPsec), intrusion prevention, and URL filtering to safeguard branch networks.
The Cisco SRST888 delivers up to 60 Mbps of IPsec VPN throughput and 100 Mbps of routing performance under typical branch loads.
Absolutely. The SRST888 is designed for seamless integration with Cisco Unified Communications Manager, ensuring uninterrupted voice services.
Voice failover is automatic—when IP WAN is down, SRST888 switches calls to local FXS/BRI ports, restoring dial tone in seconds.
It supports IPsec VPN with DES, 3DES, AES encryption, IKEv1/IKEv2 key exchange, and prerouting packet inspection for secure site-to-site tunnels.
Yes. The C888SRST-K9 is purpose-built for Cisco Unified SRST, extending call-processing features when connectivity to the primary call manager is lost.
Feature licenses are managed through Cisco Smart Licensing. You can activate advanced security, higher voice channel counts, or enhanced VPN features as needed.
Yes. It offers advanced QoS features like traffic classification, shaping, policing, and Cisco Weighted Random Early Detection (WRED) to prioritize voice and critical data.
The SRST888 is a compact, desktop-mountable unit powered by an external 60W adapter, ideal for small branch offices and remote sites.
Deployment is streamlined via Cisco Configuration Professional Express. Ongoing management is available through Cisco DNA Center or CLI for advanced control.
Cisco offers a limited lifetime hardware warranty plus access to Cisco SMARTnet for 24×7 support, software updates, and advanced replacement services.
Yes. This router supports full IPv6 routing, firewall, and VPN features, ensuring future-proof connectivity for modern IP networks.