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C881SRST-K9
- Description:
- Cisco SRST881 ENet FXS - FXO Sec Router
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C881SRST-K9 Overview
C881SRST-K9 is a fixed enterprise router engineered for branch offices that demand secure, integrated services and reliable voice capabilities even in adverse network conditions. Designed with a robust architecture, it supports multiple routing protocols and integrated VPN features, ensuring secure data and voice transmission across WAN and LAN interfaces with high throughput and redundancy for mission-critical use cases.
C881SRST-K9 combines versatile power options with a streamlined front-panel design that facilitates rapid deployment in diverse environments. With integrated services such as advanced firewall protection, SRST for voice survivability, and modular capabilities for future expansion, it meets the performance and connectivity requirements of enterprise and branch office infrastructures.
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C881SRST-K9 Specifications
| Product Type | Enterprise Router |
| VPN Support | IPSec / DMVPN / FlexVPN |
| Power Source | AC Power Supply |
| Routing Protocols | OSPF / EIGRP / RIP / BGP / Static Routing |
| Broadband | DSL |
| Architecture | Fixed |
| WAN Configuration | WAN |
| WAN Ports | 1 WAN |
| LAN Ports | 4 LAN Ports |
| Ethernet Technology | 10/100 |
| Wi-Fi Standard | N/A |
| Connectivity Type | Wired |
| Network Protocols | IPv4, IPv6 |
| Remote Management | SSH / Telnet / SNMP |
| Compliance Standards | FCC, CE, RoHS |
| Wireless Support | No |
| Speed/Capacity | 25 Mbps |
| Firewall Features | Yes |
| Features | VPN, NAT, Firewall, QoS, SRST, Voice, Integrated Security |
| Use Case | Enterprise, Branch Office |
| Management | Managed |
| Form Factor | Desktop |
| Integrated Services | Voice, Secure WAN, Unified Communications |
| High Availability Support | Supported |
| Safety | N/A |
| EMC | N/A |
| Telecom | N/A |
| Throughput Capacity | 0.025 Gbps |
| QoS Features | Supported |
| Built-in Security Features | Firewall, Intrusion Prevention, Malware Protection |
| Expansion Slots | N/A |
| Modular Slots Available | N/A |
| Stacking Capability | No |
| 5G Support | No |
| Memory | 256 MB |
| Flash Memory | 128 MB |
| Interface Ports | RJ-45 |
| Power | 20W |
| Device Type | Router |
| Product Name | Cisco 881SRST-K9 Integrated Services Router |
| Height | N/A |
| Width | N/A |
| Depth | N/A |
| Weight | N/A |
C881SRST-K9 Use Case
Branch Office Telephony Continuity with PSTN Fallback
In a multi-site enterprise running Cisco Unified Communications Manager, a WAN disruption can interrupt IP telephony. Deploying the C881SRST-K9 SRST881 ENet FXS-FXO router in each branch enables Survivable Remote Site Telephony (SRST). When the primary WAN link fails, the FXO port automatically routes inbound/outbound voice calls over the local PSTN circuit, maintaining uninterrupted voice service. Benefit: zero downtime for critical business calls, enhanced customer experience, and compliance with continuity SLAs.
Secure Site-to-Site VPN for Remote Branch Connectivity
A financial services firm requires encrypted connectivity between its data center and distributed offices. The Cisco SRST881 C881SRST-K9 integrates a high-performance IPsec VPN gateway, firewall, and ACLs to establish secure tunnels over the public Internet. Using built-in AES-256 encryption and centralized Cisco Security Manager policies, remote sites exchange sensitive data and VoIP traffic without exposure. Benefit: end-to-end data confidentiality, simplified VPN management, and reduced hardware footprint at each branch.
Legacy Analog Device Integration in Healthcare Clinics
A chain of outpatient clinics relies on analog fax machines and patient emergency phones alongside IP phones. The C881SRST-K9’s two FXS ports connect analog endpoints directly, while its router and security features protect clinical data on the LAN. Clinicians can fax prescriptions and use bedside phones, and in the event of a network outage, SRST mode preserves analog call paths. Benefit: seamless unification of analog and VoIP devices, cost-effective deployment, and uninterrupted patient communication.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
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| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Fixed | Fixed | Fixed |
| Broadband | DSL | DSL | N/A | N/A | DSL |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall, Intrusion Prevention, Malware Protection |
| Compliance Standards | FCC / CE | FCC / CE | FCC, CE | FCC / CE / UL | FCC, CE, RoHS |
| Connectivity Type | Wired | Wired | Wired | Wired / Wireless / Ethernet | Wired |
| Depth | N/A | N/A | 8.0 inches | N/A | 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 | N/A | N/A |
| Features | VPN / IPv6 Compatible / Firewall | VPN / IPv6 Compatible / Firewall | VPN / IPv6 Compatible / Firewall | VPN / VoIP / IPv6 Compatible / Firewall | VPN, NAT, Firewall, QoS, SRST, Voice, Integrated Security |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 128 MB | 128 MB | 128 MB |
| Form Factor | Desktop | Desktop | Desktop | Desktop | Desktop |
| Height | N/A | N/A | 1.0 inches | N/A | N/A |
| High Availability Support | Not Supported | Not Supported | Not Supported | Supported | Supported |
| Integrated Services | Voice | Voice | Voice / Video | Voice / Video / WAN Optimization | Voice, Secure WAN, Unified Communications |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 / SFP | 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 | 256 MB | 256 MB | 256 MB | 256 MB |
| Modular Slots Available | N/A | N/A | N/A | N/A | N/A |
| Network Protocols | IPv4 / IPv6 | IPv4 / IPv6 / NAT | IP, IPv6, QoS | IPv4, IPv6, TCP, UDP, ICMP | IPv4, IPv6 |
| Power | 25W | 18W | 22.8 Watt | 65W | 20W |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply / Redundant | AC Power Supply / DC Power Supply / Redundant | AC Power Supply |
| Product Name | CISCO877-SEC-K9 | CISCO878-SEC-K9 Secure Router | Cisco 851 Wireless Services Router | CISCO857W-G-A-K9 Integrated Services Router | Cisco 881SRST-K9 Integrated Services Router |
| Product Type | Enterprise Router | Integrated Services Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | Telnet / SSH | HTTP / HTTPS / SNMP / Telnet / SSH | Telnet, SSH, SNMP | CLI, SNMP, Telnet, SSH | SSH / Telnet / SNMP |
| Routing Protocols | OSPF / EIGRP / RIP / Static Routing | OSPF / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / BGP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | N/A | Fast Ethernet | Gigabit | N/A | 25 Mbps |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 0.01 Gbps | 50 Mbps | 0.025 Gbps | 100 Mbps | 0.025 Gbps |
| Use Case | Small Business | Small Business / Branch Office | Enterprise | Enterprise | Enterprise, Branch Office |
| VPN Support | IPSec / SSL VPN | IPSec / DMVPN / FlexVPN | IPSec / SSL VPN / N/A | IPSec / SSL VPN / DMVPN | IPSec / DMVPN / FlexVPN |
| WAN Configuration | WAN | WAN | WAN | Dual WAN | WAN |
| WAN Ports | 1 WAN | 1 WAN | 1 WAN | 2 WAN | 1 WAN |
| Weight | N/A | N/A | 4.5 lbs | N/A | N/A |
| Wi-Fi Standard | N/A | N/A | WiFi 4 | WiFi 4 / Dual band | N/A |
| Width | N/A | N/A | 9.0 inches | N/A | N/A |
| Wireless Support | No | No | Yes | Yes | No |
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Questions & Answers
Q
What is the Cisco SRST881 ENet FXS-FXO Sec Router (SKU: C881SRST-K9)?
A
The Cisco SRST881 ENet FXS-FXO Sec Router (C881SRST-K9) is a secure branch-office router that integrates Survivable Remote Site Telephony (SRST), multiport Ethernet, analog voice ports, and advanced security features in a compact desktop form factor.
Q
What are the key features of the Cisco C881SRST-K9 router?
A
Key features include 8 10/100 Ethernet ports, 2 FXS and 2 FXO analog voice ports, SRST for Cisco Unified Communications survivability, stateful firewall, intrusion prevention, and IPsec VPN support.
Q
How many Ethernet, FXS, and FXO ports does the SRST881 support?
A
The SRST881 provides 8 10/100 Ethernet ports for LAN/WAN connectivity, 2 FXS ports for IP phone fallback, and 2 FXO ports for PSTN connectivity in survivable mode.
Q
What is Survivable Remote Site Telephony (SRST) and how does the C881SRST-K9 implement it?
A
SRST is Cisco’s failover telephony feature that keeps IP phones operational during WAN outages; the C881SRST-K9 hosts a built-in SRST application to maintain call processing locally.
Q
What security features are built into the Cisco SRST881 router?
A
Integrated security includes a stateful packet firewall, Cisco IOS Intrusion Prevention System (IPS), Secure Boot, Secure Shell (SSH), and advanced URL filtering.
Q
Does the SRST881 support VPN connectivity for remote sites?
A
Yes. The C881SRST-K9 supports up to 50 IPsec site-to-site VPN tunnels, dynamic multipoint VPN (DMVPN), and SSL VPN for secure remote access.
Q
What performance specifications can I expect from the C881SRST-K9?
A
The router delivers up to 25 Mbps aggregate throughput, supports 256 VLANs, and handles up to 150 concurrent voice calls under SRST mode.
Q
Which Cisco IOS versions are compatible with the C881SRST-K9?
A
The SRST881 runs Cisco IOS Software Release 15.x with Security and Unified Communications feature sets; specific image versions are listed in Cisco’s compatibility matrix.
Q
How do I upgrade the firmware on the Cisco SRST881?
A
Use the Cisco CLI to copy a compatible IOS image via USB, TFTP, FTP, or SCP to flash: “copy tftp://<server>/<image.bin> flash:” then reload the device.
Q
What power supply options are available for the SRST881 router?
A
The C881SRST-K9 includes an internal universal power supply (100–240 VAC) with auto-switching and supports optional DC power modules for limited environments.
Q
Can I rack-mount or wall-mount the Cisco SRST881?
A
Yes. The SRST881 ships with rack ears for 19″ mounting and includes a wall-mount bracket kit for flexible deployment in small closets or offices.
Q
What analog voice fallback capabilities does the SRST881 offer?
A
During WAN failure, SRST881 uses its 2 FXS ports to provide IP phone registration and 2 FXO ports to maintain PSTN dial tone for continuity of analog and IP calls.
Q
Is the C881SRST-K9 suitable for small or medium branch offices?
A
Absolutely. Its compact design, integrated security, VPN, and telephony survivability make it ideal for small to medium branch locations requiring reliable voice and data services.
Q
What warranty and support options are available for SKU C881SRST-K9?
A
The SRST881 includes a 90-day Cisco SMARTnet limited warranty; extended SMARTnet and Software Support Service (SWSS) contracts are available for 24×7 hardware replacement and software updates.
Q
What items are included in the box with the Cisco SRST881 router?
A
The package contains the SRST881 router, power cord, rack-mount ears, wall-mount brackets, console cable, and a Quick Start guide. A full-featured IOS image is pre-installed.
