United States
Name:
C1861-SRST-B/K9
- Description:
- 1861,8-user SRST or CME,4FXS, 2BRI, 8xPOE,SP Svcs, HWIC slot
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- 882658180637
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All enterprise hardware is backed by a 3-year warranty — triple the industry standard — covering defects under normal use.
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If a hardware issue is confirmed, we’ll repair or replace the unit. Replacement parts carry either original or 3-month coverage.
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Once an RMA is approved, return the defective unit within 10 days. We handle the rest — no service gaps.
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In some regions, return-to-factory or remote service may apply. On-site service depends on infrastructure availability.
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C1861-SRST-B/K9 Overview
C1861-SRST-B/K9 is a fixed, enterprise-grade integrated services router built with a robust architecture that emphasizes secure connectivity and efficient performance. It features AC power supply options, integrated Ethernet interfaces for both WAN and LAN connectivity, and advanced VPN capabilities that ensure reliable remote site access.
The router supports modular expansion via dual EHWIC slots, delivering enhanced throughput performance of up to 0.035 Gbps and integrated voice services. Designed for small to medium branch office deployments, the C1861-SRST-B/K9 meets business use cases with built-in firewall protection, NAT, and a suite of routing protocols for dependable network redundancy and performance.
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C1861-SRST-B/K9 Specifications
| Product Type | Enterprise Router |
| VPN Support | IPSec / SSL VPN |
| Power Source | AC Power Supply |
| Routing Protocols | OSPF / EIGRP / RIP / BGP / Static Routing |
| Broadband | N/A |
| Architecture | Fixed |
| WAN Configuration | WAN |
| WAN Ports | 2 WAN |
| LAN Ports | Modular LAN |
| Ethernet Technology | 10/100 |
| Wi-Fi Standard | N/A |
| Connectivity Type | Wired |
| Network Protocols | IPv4 / IPv6 / MPLS / VPN |
| Remote Management | Telnet / SSH / SNMP |
| Compliance Standards | IEEE 802.3 / IEEE 802.3u / FCC / CE |
| Wireless Support | No |
| Speed/Capacity | Gigabit |
| Firewall Features | Yes |
| Features | VPN / Voice / NAT / Firewall |
| Use Case | Enterprise / Small Business |
| Management | Managed |
| Form Factor | Desktop |
| Integrated Services | Voice |
| High Availability Support | Not Supported |
| Safety | UL / CE / RoHS |
| EMC | FCC / CE |
| Telecom | N/A |
| Throughput Capacity | 0.035 Gbps |
| QoS Features | Supported |
| Built-in Security Features | Firewall / Intrusion Prevention / Malware Protection |
| Expansion Slots | EHWIC |
| Modular Slots Available | 2 Slots |
| Stacking Capability | No |
| 5G Support | No |
| Memory | 512 MB |
| Flash Memory | 256 MB |
| Interface Ports | RJ-45 |
| Power | 45 Watt |
| Device Type | Router |
| Product Name | Cisco 1861 Integrated Services Router with SRST |
| Height | 1.72 inches |
| Width | 17 inches |
| Depth | 12 inches |
| Weight | 9.5 lbs |
C1861-SRST-B/K9 Use Case
Branch Office Survivable Telephony with SRST on Cisco 1861
Enterprises deploy the Cisco 1861 router in branch offices running SRST mode to maintain local call processing for up to eight IP phones whenever the WAN link fails. Integrated 8-user SRST and CME ensure uninterrupted voice service, emergency dialing and internal extensions remain available. Benefit: enhanced business continuity, zero voice downtime and consistent QoS for mission-critical communications.
SMB Campus IP Telephony and PoE Deployment
Small to mid-sized campuses leverage the Cisco 1861’s eight PoE ports to power VoIP phones and wireless APs directly, eliminating separate power injectors and reducing rack footprint. With built-in CME and SP Svcs for secure VPN and QoS, IT teams can rapidly provision voice/data services while ensuring bandwidth prioritization. Benefit: simplified infrastructure, lower CAPEX/OPEX, and accelerated rollout of unified communications.
Service Provider Managed Multi-Service Edge for SMB Branches
Service providers install the Cisco 1861 router at customer sites to deliver MPLS, secure VPN and traffic-shaping via SP Svcs, while eight PoE ports support on-premise IP phones and wireless APs. The 4 FXS and 2 BRI interfaces provide PSTN backup, and the HWIC slot allows plug-in LTE or additional voice modules for resilience. Benefit: SLA-backed multi-service delivery, scalable connectivity and guaranteed voice/data performance.
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 | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC / CE / UL | IEEE 802.3 / IEEE 802.3u / FCC / CE | FCC, CE | FCC, CE | FCC / CE |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired / Wireless |
| Depth | N/A | 12 inches | N/A | N/A | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | FCC / CE | N/A | N/A | N/A |
| Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | EHWIC | EHWIC | NIM | EHWIC | N/A |
| Features | VPN / VoIP / IPv6 Compatible / Firewall | VPN / Voice / NAT / Firewall | VPN / VoIP / IPv6 Compatible / Firewall | VPN / Firewall / IPv6 Compatible | VPN / VoIP / Firewall / IPv6 Compatible |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 128 MB | 256 MB | 256 MB | 256 MB | 128 MB |
| Form Factor | Desktop | Desktop | Desktop | Desktop | Desktop |
| Height | N/A | 1.72 inches | N/A | N/A | N/A |
| High Availability Support | Not Supported | Not Supported | Not Supported | Supported | Not Supported |
| Integrated Services | Voice | Voice | Voice | Voice | Voice |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | 4 LAN Ports | Modular LAN | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 512 MB | 512 MB | 256 MB | 256 MB |
| Modular Slots Available | 1 Slot | 2 Slots | 1 Slot | 1 Slot | N/A |
| Network Protocols | IPv4, IPv6, MPLS | IPv4 / IPv6 / MPLS / VPN | IPv4, IPv6 | IPv4, IPv6, NAT, PAT | TCP/IP, UDP, ICMP, IGMP |
| Power | 65W | 45 Watt | 65 W | 65 Watt | 65 Watts |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply |
| Product Name | Cisco 1861W Integrated Services Router with SRST | Cisco 1861 Integrated Services Router with SRST | CISCO1811/K9 Integrated Services Router | Cisco C1861-4F-VSEC/K9 Integrated Services Router | Cisco 1861W Integrated Services Router for Unified Communications |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | CLI, SNMP, HTTP/HTTPS | Telnet / SSH / SNMP | Telnet, SSH, SNMP | Telnet, SSH, SNMP | CLI, SNMP, HTTP/HTTPS |
| Routing Protocols | OSPF / EIGRP / BGP / RIP / Static Routing | OSPF / EIGRP / RIP / BGP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / BGP | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | UL / CE / RoHS | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | Gigabit | N/A | N/A | N/A |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | N/A | 0.035 Gbps | 0.012 Gbps | 0.025 Gbps | 0.025 Gbps |
| Use Case | Small Business | Enterprise / Small Business | Small Business | Business | Business |
| VPN Support | IPSec / SSL VPN / DMVPN / N/A | IPSec / SSL VPN | IPSec | IPSec | IPSec |
| WAN Configuration | Dual WAN | WAN | Dual WAN | WAN | WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 4 WAN | 1 WAN |
| Weight | N/A | 9.5 lbs | N/A | N/A | N/A |
| Wi-Fi Standard | WiFi 4 | N/A | N/A | N/A | WiFi 3 |
| Width | N/A | 17 inches | N/A | N/A | N/A |
| Wireless Support | Yes | No | No | No | Yes |
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Questions & Answers
Q
What is the Cisco 1861 ISR (C1861-SRST-B/K9) designed for?
A
The Cisco 1861 ISR is a branch office router optimized for small to medium enterprises, offering secure data, voice, and video services with support for SRST or CME fallback.
Q
How many voice endpoints does the Cisco 1861 ISR support?
A
The Cisco 1861 ISR supports up to eight SRST or CME users with four FXS and two BRI ports for analog and ISDN voice connectivity.
Q
What Power over Ethernet (PoE) capabilities does it offer?
A
The Cisco 1861 ISR provides eight integrated PoE ports delivering up to 15.4 W per port, enabling direct support for IP phones and wireless access points.
Q
What is Survivable Remote Site Telephony (SRST)?
A
SRST is Cisco’s failover feature that ensures continuous telephony services at remote sites by maintaining call control locally if the connection to the central call manager is lost.
Q
Can the Cisco 1861 ISR be used for Cisco Unified CME?
A
Yes, the 1861 ISR supports Cisco Unified Communications Manager Express (CME) to provide on-site call processing and advanced voice features without a separate call server.
Q
What service provider services are supported on this router?
A
The Cisco 1861 ISR supports broadband, MPLS, Metro Ethernet, and VPN services, enabling secure, high-performance WAN connectivity from a single platform.
Q
Does the Cisco 1861 ISR include an expansion slot?
A
Yes, the router features one HWIC slot for deploying additional network modules such as serial, wireless, or extra voice interfaces.
Q
What is the maximum data throughput of the 1861 ISR?
A
The Cisco 1861 ISR delivers up to 75 Mbps of aggregate data throughput, ideal for small branch office applications.
Q
Which security features are integrated in this router?
A
The Cisco 1861 ISR includes Cisco IOS Firewall, IPS, VPN (Site-to-Site and Remote Access), and Secure Boot for comprehensive branch security.
Q
Does the 1861 ISR support VPN connectivity?
A
Yes, it supports both IPsec and SSL VPNs to secure site-to-site and remote user connections with hardware-accelerated encryption.
Q
What licensing options are available?
A
The Cisco 1861 ISR offers Cisco Unified Communications licensing for SRST or CME, bundled security packages, and performance-on-demand upgrades via SMART Net.
Q
How do I configure the FXS and BRI ports?
A
FXS and BRI ports are configured through the Cisco IOS command-line interface using voice port and dial-peer commands for analog and ISDN connectivity.
Q
What monitoring and management tools are supported?
A
The 1861 ISR is compatible with Cisco Prime Infrastructure, SNMP, NetFlow, and Embedded Event Manager for real-time monitoring and proactive management.
Q
What are the physical and environmental specifications?
A
The Cisco 1861 ISR measures 1.75 x 11.5 x 10.5 inches, weighs 3.5 lbs, and supports operating temperatures from 32°F to 104°F (0°C to 40°C).
Q
What warranty and support options are available?
A
Cisco provides a one-year limited hardware warranty with next-business-day replacement and optional SMART Net contracts for extended support.
Q
Which deployment scenarios are ideal for the Cisco 1861 ISR?
A
The 1861 ISR is ideal for small branch offices, retail outlets, and teleworker sites requiring integrated voice, secure data, and wireless services on a single platform.
