United States$5,000,000+
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J
James Lewis
5
Reliable 1861 with SRST and CME support. Ensures voice and data continuity during WAN outages.
C1861-SRST-B/K9
1861,8-user SRST or CME,4FXS, 2BRI, 8xPOE,SP Svcs, HWIC slot
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C1861-SRST-B/K9
- Description:
- 1861,8-user SRST or CME,4FXS, 2BRI, 8xPOE,SP Svcs, HWIC slot
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- Brand:
- Cisco
- GTIN:
- 882658180637
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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.
C1861-SRST-B/K9 price is is available on request. Get immediate quote.
Request bulk order quote for C1861-SRST-B/K9 for additional pricing. Browse the full Router Isr 1800 series or explore all Cisco products.
C1861-SRST-B/K9 Specifications
- Power Source
- AC Power Supply
- Flash Memory
- 256 MB
- Memory
- 512 MB
- Depth
- 12 inches
- Ethernet Technology
- 10/100
- Form Factor
- Desktop
- Width
- 17 inches
- Height
- 1.72 inches
- Weight
- 9.5 lbs
- Product Type
- Enterprise Router
- Architecture
- Fixed
- WAN Ports
- 2 WAN
- Wi-Fi Standard
- N/A
- Connectivity Type
- Wired
- Wireless Support
- No
- Firewall Features
- Yes
- Management
- Managed
- High Availability Support
- Not Supported
- Telecom
- N/A
- QoS Features
- Supported
- Modular Slots Available
- 2 Slots
- Stacking Capability
- No
- 5G Support
- No
- Interface Ports
- RJ-45
- Device Type
- Router
- WAN Configuration
- WAN
- Expansion Slots
- EHWIC
- VPN Support
- IPSec / SSL VPN
- Broadband
- N/A
- Remote Management
- Telnet / SSH / SNMP
- Integrated Services
- Voice
- EMC
- FCC / CE
- Power
- 45 Watt
- LAN Ports
- Modular LAN
- Use Case
- Enterprise / Small Business
- Built-in Security Features
- Firewall / Intrusion Prevention / Malware Protection
- Speed/Capacity
- Gigabit
- Network Protocols
- IPv4 / IPv6 / MPLS / VPN
- Routing Protocols
- OSPF / EIGRP / RIP / BGP / Static Routing
- Throughput Capacity
- 0.035 Gbps
- Product Name
- Cisco 1861 Integrated Services Router with SRST
- Compliance Standards
- IEEE 802.3 / IEEE 802.3u / FCC / CE
- Features
- VPN / Voice / NAT / Firewall
- Safety
- UL / CE / RoHS
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
 C1861-SRST-B/K9 |  CISCO1811/K9 |  C1861W-UC-2BRI-K9 |  C1861W-SRST-C-F/K9 |  C1861-4F-VSEC/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 / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall |
| Compliance Standards | IEEE 802.3 / IEEE 802.3u / FCC / CE | FCC, CE | FCC / CE | FCC / CE / UL | FCC, CE |
| Connectivity Type | Wired | Wired | Wired / Wireless | Wired | Wired |
| Depth | 12 inches | N/A | N/A | N/A | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | FCC / CE | N/A | N/A | N/A | N/A |
| Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | EHWIC | NIM | N/A | EHWIC | EHWIC |
| Features | VPN / Voice / NAT / Firewall | VPN / VoIP / IPv6 Compatible / Firewall | VPN / VoIP / Firewall / IPv6 Compatible | VPN / VoIP / IPv6 Compatible / Firewall | VPN / Firewall / IPv6 Compatible |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 128 MB | 128 MB | 256 MB |
| Form Factor | Desktop | Desktop | Desktop | Desktop | Desktop |
| Height | 1.72 inches | N/A | N/A | N/A | N/A |
| High Availability Support | Not Supported | Not Supported | Not Supported | Not Supported | Supported |
| Integrated Services | Voice | Voice | Voice | Voice | Voice |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | Modular LAN | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 512 MB | 256 MB | 512 MB | 256 MB |
| Modular Slots Available | 2 Slots | 1 Slot | N/A | 1 Slot | 1 Slot |
| Network Protocols | IPv4 / IPv6 / MPLS / VPN | IPv4, IPv6 | TCP/IP, UDP, ICMP, IGMP | IPv4, IPv6, MPLS | IPv4, IPv6, NAT, PAT |
| Power | 45 Watt | 65 W | 65 Watts | 65W | 65 Watt |
| 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 | CISCO1811/K9 Integrated Services Router | Cisco 1861W Integrated Services Router for Unified Communications | Cisco 1861W Integrated Services Router with SRST | Cisco C1861-4F-VSEC/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 | Telnet / SSH / SNMP | Telnet, SSH, SNMP | CLI, SNMP, HTTP/HTTPS | CLI, SNMP, HTTP/HTTPS | Telnet, SSH, SNMP |
| Routing Protocols | OSPF / EIGRP / RIP / BGP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / BGP / RIP / Static Routing | OSPF / EIGRP / RIP / BGP |
| Safety | UL / CE / RoHS | N/A | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | N/A | 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 | 0.035 Gbps | 0.012 Gbps | 0.025 Gbps | N/A | 0.025 Gbps |
| Use Case | Enterprise / Small Business | Small Business | Business | Small Business | Business |
| VPN Support | IPSec / SSL VPN | IPSec | IPSec | IPSec / SSL VPN / DMVPN / N/A | IPSec |
| WAN Configuration | WAN | Dual WAN | WAN | Dual WAN | WAN |
| WAN Ports | 2 WAN | 2 WAN | 1 WAN | 2 WAN | 4 WAN |
| Weight | 9.5 lbs | N/A | N/A | N/A | N/A |
| Wi-Fi Standard | N/A | N/A | WiFi 3 | WiFi 4 | N/A |
| Width | 17 inches | N/A | N/A | N/A | N/A |
| Wireless Support | No | No | Yes | Yes | No |
Reviews & Ratings
G
Grace Johnson
4
Cisco 1861-SRST-B provides stable POE, WLAN, and voice services. Easy to configure for branch offices.
M
Megan White
5
Strong performance under load. SRST backup keeps calls running smoothly.
D
David Harris
3
Consistent uptime and robust security. Ideal for small offices with unified communication needs.
Z
Zoe Mitchell
4
Trusted Cisco build quality. Ensures branch office continuity with minimal downtime.
Questions & Answers
What is the Cisco 1861 ISR (C1861-SRST-B/K9) designed for?
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.
How many voice endpoints does the Cisco 1861 ISR support?
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.
What Power over Ethernet (PoE) capabilities does it offer?
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.
What is Survivable Remote Site Telephony (SRST)?
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.