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Olivia Mitchell
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Cisco 1861-SRST-C-F offers robust SRST and POE support. Reliable for voice and data continuity in branch offices.
C1861-SRST-C-F/K9
1861,8-user SRST or CME,CUE,4FXS,4FXO,8POE,SP Svcs,HWIC slot
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C1861-SRST-C-F/K9
- Description:
- 1861,8-user SRST or CME,CUE,4FXS,4FXO,8POE,SP Svcs,HWIC slot
- Rating:
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- Brand:
- Cisco
- GTIN:
- 882658184963
- Condition:
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C1861-SRST-C-F/K9 Overview
C1861-SRST-C-F/K9 is a fixed, integrated services router engineered for branch office connectivity with robust performance and security features. It features dual WAN and four LAN ports over 10/100 Ethernet technology, an internal AC power supply, and built‐in VPN support—including IPSec, SSL VPN, and DMVPN—to secure remote communications while delivering high throughput and low latency for real-time applications.
The device offers integrated services for voice and data with SRST (Survivable Remote Site Telephony) capabilities, modular expansion via an EHWIC slot, and comprehensive routing protocols (OSPF, EIGRP, RIP, BGP, and static routing) for diverse network environments. Its redundancy support, QoS, and firewall features make it ideal for enterprise, small business, and branch office use cases where reliable performance and secure connectivity are essential.
C1861-SRST-C-F/K9 price is is available on request. Get immediate quote.
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C1861-SRST-C-F/K9 Specifications
- Power Source
- AC Power Supply
- Memory
- 256 MB
- Height
- 1.73 inches
- Flash Memory
- 256 MB
- Ethernet Technology
- 10/100
- Form Factor
- Desktop
- Width
- 17.30 inches
- VPN Support
- IPSec / SSL VPN / DMVPN
- 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
- Remote Management
- Telnet, SSH, SNMP
- Compliance Standards
- FCC, CE
- Wireless Support
- No
- Firewall Features
- Yes
- Management
- Managed
- Safety
- N/A
- EMC
- N/A
- Telecom
- N/A
- QoS Features
- Supported
- Built-in Security Features
- Firewall, Intrusion Prevention
- Stacking Capability
- No
- 5G Support
- No
- Interface Ports
- RJ-45
- Device Type
- Router
- High Availability Support
- Supported
- Expansion Slots
- EHWIC
- Broadband
- N/A
- Modular Slots Available
- 1 Slot
- LAN Ports
- 4 LAN Ports
- Speed/Capacity
- Fast Ethernet
- Product Type
- Integrated Services Router
- Integrated Services
- Voice, Data
- Throughput Capacity
- 20 Mbps
- Power
- 65 Watts
- Use Case
- Enterprise, Small Business, Branch Office
- Network Protocols
- IPv4, IPv6, OSPF, EIGRP, RIP, BGP
- Features
- VPN, NAT, QoS, Firewall, SRST
- Product Name
- Cisco 1861 Integrated Services Router with SRST
- Depth
- 14.10 inches
- Weight
- 16.80 lbs
C1861-SRST-C-F/K9 Use Case
Branch Office Voice Continuity and PoE Edge Deployment
A financial services firm with multiple branches deploys the C1861-SRST-C-F/K9 to power eight PoE IP phones and deliver built-in SRST for up to eight users when the WAN link fails. This ensures zero voice downtime during network outages and meets strict regulatory availability requirements. Outcome: uninterrupted telephony, reduced SLA penalties and consolidated edge infrastructure.
Integrated Unified Messaging and Auto-Attendant for SMB
A mid-sized legal practice implements the router’s Cisco Unified CME and CUE licenses to host on-premise voicemail, hunt groups and multi-level auto-attendants without additional servers. The all-in-one 1861 platform simplifies deployment, cuts CAPEX/OPEX, and accelerates rollout. Outcome: streamlined call handling, faster client response times and lower total cost of ownership.
Hybrid PSTN/VoIP Convergence with FXO/FXS and SP Services
A retail chain leverages the router’s 4 FXO ports for primary PSTN lines and 4 FXS ports for analog POS terminals, while SP Services and the HWIC slot deliver broadband WAN and SLA-backed ISP failover. This hybrid architecture balances voice quality, cost and resilience across hundreds of remote outlets. Outcome: flexible connectivity, optimized telco spend and automatic PSTN/VoIP failover.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 C1861-SRST-C-F/K9 |  C1841-3G-S |  C1841-3G-V-SEC/K9 |  C1861W-UC-4FXO-K9 |  CISCO1803/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Fixed | Fixed | Fixed |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall, Intrusion Prevention | Firewall / Intrusion Prevention | Firewall, Intrusion Prevention, Malware Protection | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC, CE | FCC / CE / UL | FCC, CE | FCC / CE / UL | FCC / CE |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Depth | 14.10 inches | N/A | 14.6 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 | EHWIC | EHWIC | EHWIC | EHWIC | EHWIC |
| Features | VPN, NAT, QoS, Firewall, SRST | VPN / VoIP / IPv6 Compatible / Firewall | VPN, Firewall, Intrusion Prevention, NAT, QoS, Routing | VPN / VoIP / IPv6 Compatible / Firewall | VPN / IPv6 Compatible / Firewall / Voice |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 256 MB | 256 MB | 128 MB |
| Form Factor | Desktop | Desktop | Desktop / Rack-mount | Desktop | Rack-mount |
| Height | 1.73 inches | N/A | 1.73 inches | N/A | 1.75 inches |
| High Availability Support | Supported | Not Supported | Not Supported | Not Supported | Not Supported |
| Integrated Services | Voice, Data | Voice / Video / WAN Optimization | Voice, VPN, Security | Voice / Video | Voice / Video |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | 4 LAN Ports | N/A | 2 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 256 MB | 128 MB | 128 MB | 512 MB | 256 MB |
| Modular Slots Available | 1 Slot | 2 Slots | 2 Slots | 1 Slot | 2 Slots |
| Network Protocols | IPv4, IPv6, OSPF, EIGRP, RIP, BGP | IPv4 / IPv6 | IPv4, IPv6, TCP/IP | IP / IPX / PPP | TCP/IP / IPX |
| Power | 65 Watts | 65W | 65 Watts | 50W | 65 Watts |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply |
| Product Name | Cisco 1861 Integrated Services Router with SRST | Cisco C1841-3G-S Integrated Services Router | Cisco 1841 Integrated Services Router C1841-3G-V-SEC/K9 | Cisco 1861W UC 4FXO | Cisco 1803/K9 Integrated Services Router |
| Product Type | Integrated Services Router | Enterprise Router | Enterprise Router | Integrated Services Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | Telnet, SSH, SNMP | Telnet / SSH / SNMP | Telnet, SSH, SNMP, HTTP/HTTPS | CLI / Web-based | CLI / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / BGP / Static Routing | EIGRP / OSPF / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | Fast Ethernet | N/A | Fast Ethernet | Gigabit | Fast Ethernet |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 20 Mbps | 0.025 Gbps | 33 Mbps | 0.025 Gbps | 25 Mbps |
| Use Case | Enterprise, Small Business, Branch Office | Enterprise | Enterprise / Small Business | Enterprise | Small Business / Enterprise |
| VPN Support | IPSec / SSL VPN / DMVPN | IPSec | IPSec / SSL VPN | IPSec / SSL VPN | IPSec / GRE / DMVPN |
| WAN Configuration | Dual WAN | WAN | WAN | WAN | Dual WAN |
| WAN Ports | 2 WAN | 1 WAN | 1 WAN | 2 WAN | 2 WAN |
| Weight | 16.80 lbs | N/A | 8.6 lbs | N/A | 6.6 lbs |
| Wi-Fi Standard | N/A | N/A | N/A | WiFi 4 | N/A |
| Width | 17.30 inches | N/A | 17.2 inches | N/A | 17 inches |
| Wireless Support | No | No | No | Yes | No |
Reviews & Ratings
D
David Adams
4
Stable all-in-one UC router. Handles calls, POE devices, and WLAN efficiently.
S
Sophia Walker
5
Reliable SRST backup ensures uninterrupted voice services. Easy to configure for branch deployments.
B
Benjamin Young
3
Consistent uptime and dependable Cisco build. Ideal for offices requiring secure and resilient connectivity.
J
James White
4
All-in-one solution with strong performance. Maintains business-critical voice and data operations without issues.
Questions & Answers
What is the Cisco C1861-SRST-C-F/K9 integrated services router?
The C1861-SRST-C-F/K9 is a Cisco 1861 ISR platform tailored for small to medium branch offices, featuring 8-user SRST or CME, Cisco Unity Express, 4 FXS/4 FXO ports, 8 PoE ports, service provider services, and an HWIC slot.
How many VoIP users does the Cisco 1861 router support under SRST or CME?
It supports up to eight concurrent VoIP calls in Survivable Remote Site Telephony (SRST) or Cisco CallManager Express (CME) mode for uninterrupted branch telephony.
What PoE capabilities does the C1861-SRST-C-F/K9 provide?
The router offers eight integrated 10/100 PoE ports, delivering up to 15.4W per port to power IP phones, wireless access points, and security cameras without separate injectors.
Does this model include Cisco Unity Express (CUE) for voicemail?
Yes, the C1861-SRST-C-F/K9 includes Cisco Unity Express for on-premises voicemail, auto-attendant, and unified messaging tailored to branch office needs.