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Cisco 1861-SRST-F provides robust SRST backup and POE support. Voice and data continuity is seamless.
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
- Description:
- 1861,8-user SRST or CME,4FXS,4FXO, 8xPOE, SP Svcs, HWIC slot
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- GTIN:
- 600140883831
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C1861-SRST-F/K9 Overview
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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C1861-SRST-F/K9 Specifications
- Power Source
- AC Power Supply
- Form Factor
- Rack-mount
- Memory
- 256 MB
- Flash Memory
- 128 MB
- Ethernet Technology
- 10/100
- Weight
- N/A
- Height
- N/A
- Depth
- N/A
- Width
- N/A
- Product Type
- Enterprise Router
- Routing Protocols
- OSPF / BGP / EIGRP / RIP / Static Routing
- Architecture
- Fixed
- WAN Configuration
- Dual WAN
- WAN Ports
- 2 WAN
- Wi-Fi Standard
- N/A
- Connectivity Type
- Wired
- Wireless Support
- No
- Firewall Features
- Yes
- Management
- Managed
- Safety
- N/A
- EMC
- N/A
- Telecom
- N/A
- QoS Features
- Supported
- Stacking Capability
- No
- 5G Support
- No
- Interface Ports
- RJ-45
- Device Type
- Router
- Remote Management
- SSH, Telnet, SNMP
- High Availability Support
- Supported
- VPN Support
- IPSec / SSL VPN
- Broadband
- N/A
- Speed/Capacity
- N/A
- Use Case
- Enterprise
- Integrated Services
- Voice / Video
- LAN Ports
- 4 LAN Ports
- Features
- VPN / VoIP / IPv6 Compatible / Firewall
- Power
- 65W
- Throughput Capacity
- 0.05 Gbps
- Built-in Security Features
- Firewall / Intrusion Prevention / Malware Protection
- Modular Slots Available
- N/A
- Expansion Slots
- N/A
- Network Protocols
- TCP/IP, UDP, ICMP
- Compliance Standards
- IEEE 802.3, IEEE 802.3u
- Product Name
- Cisco C1861-SRST-F/K9
C1861-SRST-F/K9 Use Case
Branch Office Telephony Continuity with Cisco C1861 SRST
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.
SMB IP PBX Gateway Using CME with 4FXS/4FXO Integration
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.
Retail Multi-Service Edge with 8×PoE, SP Services & HWIC Expansion
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.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 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 |
Reviews & Ratings
E
Emma Jenkins
4
Stable all-in-one UC router. Handles calls, POE devices, and WLAN efficiently for branch offices.
L
Lucas Morgan
5
Reliable SRST ensures uninterrupted communications. Easy to deploy and manage.
M
Mia Foster
3
Consistent performance under load. Cisco quality keeps voice and data operations running smoothly.
J
James Riley
4
Trusted Cisco build with stable WAN connectivity. Ideal for small office unified communications.
Questions & Answers
What is the Cisco 1861 ISR SRST-F/K9 (SKU: C1861-SRST-F/K9)?
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.
Which deployments benefit most from the C1861-SRST-F/K9 router?
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.
How many PoE ports does the Cisco 1861 ISR provide?
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.
What voice interface options are available on the C1861-SRST-F/K9?
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.