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Name:
C1861-SRST-C-F/K9
- Description:
- 1861,8-user SRST or CME,CUE,4FXS,4FXO,8POE,SP Svcs,HWIC slot
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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.
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C1861-SRST-C-F/K9 Specifications
| Product Type | Integrated Services Router |
| VPN Support | IPSec / SSL VPN / DMVPN |
| Power Source | AC Power Supply |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing |
| Broadband | N/A |
| Architecture | Fixed |
| WAN Configuration | Dual WAN |
| WAN Ports | 2 WAN |
| LAN Ports | 4 LAN Ports |
| Ethernet Technology | 10/100 |
| Wi-Fi Standard | N/A |
| Connectivity Type | Wired |
| Network Protocols | IPv4, IPv6, OSPF, EIGRP, RIP, BGP |
| Remote Management | Telnet, SSH, SNMP |
| Compliance Standards | FCC, CE |
| Wireless Support | No |
| Speed/Capacity | Fast Ethernet |
| Firewall Features | Yes |
| Features | VPN, NAT, QoS, Firewall, SRST |
| Use Case | Enterprise, Small Business, Branch Office |
| Management | Managed |
| Form Factor | Desktop |
| Integrated Services | Voice, Data |
| High Availability Support | Supported |
| Safety | N/A |
| EMC | N/A |
| Telecom | N/A |
| Throughput Capacity | 20 Mbps |
| QoS Features | Supported |
| Built-in Security Features | Firewall, Intrusion Prevention |
| Expansion Slots | EHWIC |
| Modular Slots Available | 1 Slot |
| Stacking Capability | No |
| 5G Support | No |
| Memory | 256 MB |
| Flash Memory | 256 MB |
| Interface Ports | RJ-45 |
| Power | 65 Watts |
| Device Type | Router |
| Product Name | Cisco 1861 Integrated Services Router with SRST |
| Height | 1.73 inches |
| Width | 17.30 inches |
| 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
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Product Comparison Table
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| 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, Malware Protection | Firewall, Intrusion Prevention | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC / CE / UL | FCC, CE | FCC, CE | FCC / CE / UL | FCC / CE |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Depth | N/A | 14.6 inches | 14.10 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 / VoIP / IPv6 Compatible / Firewall | VPN, Firewall, Intrusion Prevention, NAT, QoS, Routing | VPN, NAT, QoS, Firewall, SRST | 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 / Rack-mount | Desktop | Desktop | Rack-mount |
| Height | N/A | 1.73 inches | 1.73 inches | N/A | 1.75 inches |
| High Availability Support | Not Supported | Not Supported | Supported | Not Supported | Not Supported |
| Integrated Services | Voice / Video | Voice, VPN, Security | Voice, Data | Voice / Video / WAN Optimization | Voice / Video |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | 4 LAN Ports | 2 LAN Ports | 4 LAN Ports | N/A | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 128 MB | 256 MB | 128 MB | 256 MB |
| Modular Slots Available | 1 Slot | 2 Slots | 1 Slot | 2 Slots | 2 Slots |
| Network Protocols | IP / IPX / PPP | IPv4, IPv6, TCP/IP | IPv4, IPv6, OSPF, EIGRP, RIP, BGP | IPv4 / IPv6 | TCP/IP / IPX |
| Power | 50W | 65 Watts | 65 Watts | 65W | 65 Watts |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply |
| Product Name | Cisco 1861W UC 4FXO | Cisco 1841 Integrated Services Router C1841-3G-V-SEC/K9 | Cisco 1861 Integrated Services Router with SRST | Cisco C1841-3G-S Integrated Services Router | Cisco 1803/K9 Integrated Services Router |
| Product Type | Integrated Services Router | Enterprise Router | Integrated Services Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | CLI / Web-based | Telnet, SSH, SNMP, HTTP/HTTPS | Telnet, SSH, SNMP | Telnet / SSH / SNMP | CLI / SNMP |
| Routing Protocols | EIGRP / OSPF / RIP / Static Routing | OSPF / EIGRP / RIP / BGP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | Fast Ethernet | Fast Ethernet | N/A | Fast Ethernet |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 0.025 Gbps | 33 Mbps | 20 Mbps | 0.025 Gbps | 25 Mbps |
| Use Case | Enterprise | Enterprise / Small Business | Enterprise, Small Business, Branch Office | Enterprise | Small Business / Enterprise |
| VPN Support | IPSec / SSL VPN | IPSec / SSL VPN | IPSec / SSL VPN / DMVPN | IPSec | IPSec / GRE / DMVPN |
| WAN Configuration | WAN | WAN | Dual WAN | WAN | Dual WAN |
| WAN Ports | 2 WAN | 1 WAN | 2 WAN | 1 WAN | 2 WAN |
| Weight | N/A | 8.6 lbs | 16.80 lbs | N/A | 6.6 lbs |
| Wi-Fi Standard | WiFi 4 | N/A | N/A | N/A | N/A |
| Width | N/A | 17.2 inches | 17.30 inches | N/A | 17 inches |
| Wireless Support | Yes | No | No | No | No |
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Questions & Answers
Q
What is the Cisco C1861-SRST-C-F/K9 integrated services router?
A
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.
Q
How many VoIP users does the Cisco 1861 router support under SRST or CME?
A
It supports up to eight concurrent VoIP calls in Survivable Remote Site Telephony (SRST) or Cisco CallManager Express (CME) mode for uninterrupted branch telephony.
Q
What PoE capabilities does the C1861-SRST-C-F/K9 provide?
A
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.
Q
Does this model include Cisco Unity Express (CUE) for voicemail?
A
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.
Q
What analog voice interfaces are available on the 1861 ISR?
A
It features four FXS ports for analog stations and four FXO ports for PSTN connectivity, enabling seamless integration of legacy voice devices.
Q
Which expansion slot options are supported?
A
The router provides one HWIC slot for flexible WAN connectivity and modular expansion, supporting various network and security modules.
Q
What service provider features are included?
A
It supports Cisco service provider services (SP Services) such as IP voice trunking, VPN, firewall, and QoS to optimize branch WAN performance.
Q
What routing performance can I expect?
A
The Cisco 1861 delivers up to 90 Mbps of IP packet forwarding performance, ensuring reliable throughput for voice, video, and data in branch deployments.
Q
Which security features are built into the C1861 router?
A
Built-in security includes stateful firewall, intrusion prevention (IPS), VPN (IPsec/SSL), NAT, and content filtering to protect branch networks.
Q
What WAN interface speeds are supported?
A
It supports serial, T1/E1, xDSL, and Ethernet WAN interfaces via onboard ports and the HWIC slot, offering flexible connectivity options.
Q
How much onboard memory and storage does the Cisco 1861 have?
A
Standard configuration includes 256 MB DRAM, 128 MB Flash memory, and optional microSD support for IOS images and configuration backups.
Q
What are the physical dimensions and power requirements?
A
The router measures 1.7 x 11.0 x 9.4 inches, weighs 4.8 lbs, and operates on 100–240 VAC with a maximum power consumption of 50W.
Q
What Cisco IOS software does C1861-SRST-C-F/K9 support?
A
It runs Cisco IOS Software 15.x with feature sets for data, security, and unified communications to meet diverse branch requirements.
Q
How do I configure SRST on the Cisco 1861 router?
A
Enable SRST with ‘telephony-service max-ephones 8’ and ‘s rst’ commands under voice service configuration to ensure fallback call processing during WAN outages.
Q
What licensing is required for full functionality?
A
The C1861-SRST-C-F/K9 includes UC bundled licensing for 8-user SRST or CME, with upgrade options available for higher user counts and advanced features.
Q
What warranty and support options are available?
A
Cisco offers a limited lifetime warranty for hardware with 90-day software support; optional SMARTnet contracts provide 24/7 technical assistance and advance replacement.
