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C1861-SRST-F/K9
1861,8-user SRST or CME,4FXS,4FXO, 8xPOE, SP Svcs, HWIC slot
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C1861-SRST-F/K9 is a fixed enterprise router engineered with a robust modular architecture that supports integrated services such as voice and video while delivering enterprise-class VPN features. It combines versatile power options with dual WAN configurations and four LAN interfaces, ensuring resilient connectivity and built-in redundancy for mission-critical deployments.
C1861-SRST-F/K9 supports advanced routing protocols—including OSPF, BGP, EIGRP, RIP, and static routing—while offering comprehensive remote management via SSH, Telnet, and SNMP. With integrated security features like firewall, intrusion prevention, and malware protection, this router is optimized for high-availability use in enterprise scenarios where reliable throughput and performance are paramount.
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Scenario: A distributed enterprise deploys the C1861-SRST-F/K9 at a remote branch to support 8 IP extensions. When the MPLS WAN link fails, the onboard Survivable Remote Site Telephony (SRST) automatically takes over call processing, leveraging 4 FXS ports for analog phones and 4 FXO ports for PSTN fallback. Benefit: Ensures uninterrupted voice services and emergency dialing with zero configuration changes, minimizing downtime and preserving business productivity.
Scenario: A small to midsize business consolidates data and voice on a single C1861 router by enabling Cisco Unified Communications Manager Express (CME). The 4 FXS ports connect legacy analog handsets, 4 FXO ports link to the public PSTN, and 8 PoE ports power IP phones. Benefit: Delivers a cost-effective, unified communications platform that reduces monthly telco fees, simplifies management, and accelerates ROI by reusing existing analog equipment.
Scenario: A retail chain deploys the C1861 as a multi-service edge router in each store. The 8 PoE ports power wireless APs, VoIP phones, and security cameras. Service Provider Services (MPLS, QoS, IPv6) ensure prioritized traffic over the WAN. An HWIC slot hosts a 4G/5G cellular module for automatic failover. Benefit: Provides a single-box solution that streamlines branch networking, secures guest Wi-Fi, and guarantees high availability through dual-link redundancy.
To get the detailed certification, please go to the Compliance Center.
| C1861-SRST-F/K9 |  C1861-2B-VSEC/K9 |  C1861-4F-VSEC/K9 |  C1861W-SRST-C-F/K9 |  C1841-3G-S-SEC/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Fixed | Fixed | Fixed |
| Broadband | N/A | N/A | N/A | N/A | 3G |
| Built-in Security Features | Firewall / Intrusion Prevention / Malware Protection | Firewall, Intrusion Prevention, Malware Protection | Firewall | Firewall / Intrusion Prevention / Malware Protection | Firewall |
| Compliance Standards | IEEE 802.3, IEEE 802.3u | FCC, CE | FCC, CE | FCC / CE / UL | FCC / CE / UL |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Depth | N/A | 14 inches | N/A | 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 | NIM | EHWIC | EHWIC | EHWIC |
| Features | VPN / VoIP / IPv6 Compatible / Firewall | VPN, Firewall, IPv6 Compatible, Voice, Video | VPN / Firewall / IPv6 Compatible | VPN / VoIP / IPv6 Compatible / Firewall | VPN / Firewall / IPv6 Compatible |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 128 MB | 128 MB | 256 MB | 128 MB | 128 MB |
| Form Factor | Rack-mount | Desktop | Desktop | Desktop | Desktop |
| Height | N/A | 1.75 inches | N/A | N/A | N/A |
| High Availability Support | Supported | Supported | Supported | Not Supported | Not Supported |
| Integrated Services | Voice / Video | Voice, Video, WAN Optimization | Voice | Voice | Voice |
| Interface Ports | RJ-45 | RJ-45, SFP | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 2 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 256 MB | 256 MB | 256 MB | 512 MB | 512 MB |
| Modular Slots Available | N/A | 2 Slots | 1 Slot | 1 Slot | 2 Slots |
| Network Protocols | TCP/IP, UDP, ICMP | IP, VoIP | IPv4, IPv6, NAT, PAT | IPv4, IPv6, MPLS | IPv4 / IPv6 |
| Power | 65W | 85 Watt | 65 Watt | 65W | 45 W |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply |
| Product Name | Cisco C1861-SRST-F/K9 | Cisco C1861-2B-VSEC/K9 Integrated Services Router | Cisco C1861-4F-VSEC/K9 Integrated Services Router | Cisco 1861W Integrated Services Router with SRST | Cisco C1841-3G-S-SEC/K9 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH, Telnet, SNMP | SSH, Telnet, SNMP | Telnet, SSH, SNMP | CLI, SNMP, HTTP/HTTPS | SSH / Telnet / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / BGP | OSPF / EIGRP / RIP / BGP | OSPF / EIGRP / BGP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | N/A | Fast Ethernet | N/A | Gigabit | N/A |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 0.05 Gbps | 15 Mbps | 0.025 Gbps | N/A | 0.035 |
| Use Case | Enterprise | Business | Business | Small Business | Enterprise |
| VPN Support | IPSec / SSL VPN | IPSec / SSL VPN | IPSec | IPSec / SSL VPN / DMVPN / N/A | IPSec VPN |
| WAN Configuration | Dual WAN | Dual WAN | WAN | Dual WAN | WAN |
| WAN Ports | 2 WAN | 2 WAN | 4 WAN | 2 WAN | 2 WAN |
| Weight | N/A | 10 lbs | N/A | N/A | N/A |
| Wi-Fi Standard | N/A | N/A | N/A | WiFi 4 | N/A |
| Width | N/A | 17 inches | N/A | N/A | N/A |
| Wireless Support | No | No | No | Yes | No |
Cisco 1861-SRST-F provides robust SRST backup and POE support. Voice and data continuity is seamless.
Stable all-in-one UC router. Handles calls, POE devices, and WLAN efficiently for branch offices.
Reliable SRST ensures uninterrupted communications. Easy to deploy and manage.
Consistent performance under load. Cisco quality keeps voice and data operations running smoothly.
Trusted Cisco build with stable WAN connectivity. Ideal for small office unified communications.
The Cisco 1861 ISR SRST-F/K9 is an integrated services router that combines 8 PoE LAN ports, 4 FXS/4 FXO voice interfaces, an HWIC slot and built-in Survivable Remote Site Telephony (SRST) or Cisco CallManager Express (CME) functionality for small-branch deployments.
This router is ideal for small offices and branch sites requiring secure data, voice and IP telephony continuity, delivering integrated WAN and LAN services alongside built-in SRST or CME failover capabilities.
The Cisco 1861 ISR includes eight 10/100 Ethernet ports with IEEE 802.3af Power over Ethernet (PoE), supporting powered devices such as IP phones, wireless access points and cameras without external injectors.
The router features four FXS and four FXO voice ports for analog extensions and PSTN trunk connectivity, enabling seamless integration of legacy telephony devices and lines.
SRST-F/K9 denotes the Survivable Remote Site Telephony feature license; it ensures uninterrupted IP telephony during WAN outages by locally sustaining call processing for Cisco IP phones.
Yes. By installing the CME feature set, the router delivers on-premises Cisco CallManager Express functionality for up to eight voice users, providing call control and voicemail services.
The HWIC slot accommodates optional High-Speed WAN Interface Cards for additional connectivity such as serial, T1/E1, DSL or other specialized network interfaces, extending deployment flexibility.
Yes. The SP Services license is pre-installed, offering advanced routing, quality of service, VPN and multicast capabilities tailored for service providers and enterprise edge environments.
Built-in security includes a stateful firewall, intrusion prevention (IPS), VPN encryption for IPsec and SSL, secure management protocols and downloadable Cisco Trust Anchor for image validation.
SRST is enabled via the device’s CLI under telephony-service settings. You specify the fallback profile and create voice port mappings; the router automatically activates SRST when it loses WAN connectivity.
Yes. You can activate CME by loading the CME IOS image and applying the CME license key. No additional hardware purchase is required for the upgrade.
Management options include Cisco IOS CLI over console or SSH, web-based Cisco Configuration Professional, SNMP v2/v3, NetFlow and embedded event manager for automated workflows.
It delivers up to 75 Mbps aggregate throughput, supports up to 8,000 concurrent NAT sessions, 2,000 VPN tunnels and 150,000 IP routes, ensuring reliable performance for small branch environments.
The router measures 44.5 x 29.5 x 4.5 cm, weighs 4.5 kg and operates on 100–240 VAC, 50/60 Hz with an integrated universal power supply delivering PoE and system power.
Cisco provides a 1-year limited hardware warranty with software bug fixes, online technical support and the option to purchase extended service contracts for ongoing coverage.
With its HWIC expansion slot, modular voice interfaces, PoE support and software-based feature licenses, the 1861 ISR scales easily to accommodate additional WAN links, voice channels and security services.