| Model | C1861W-SRST-C-F/K9 |
| Interface | 2 integrated 10/100/1000 Ethernet ports, 4-port switch |
| WAN connectivity | 1 x Fast Ethernet |
| Wireless connectivity | 802.11 a/b/g |
| Voice features | SRST, CME, voice mail support |
| VPN | IPSec VPN |
| Security features | Firewall, intrusion prevention system (IPS), content filtering, VPN, NAT, PAT, SSH, RADIUS, TACACS+ |
| Quality of Service (QoS) | Class-Based Weighted Fair Queuing (CBWFQ), Low Latency Queuing (LLQ), Weighted Random Early Detection (WRED) |
| Memory | 512 MB DRAM, 256 MB Flash |
| Dimensions | 1.75 x 12.5 x 9.5 in. |
| Power supply | AC 100/240 V |
| Rack mountable | Yes |
| Operating temperature range | 0 to 40 degrees Celsius |
| Storage temperature range | -25 to 70 degrees Celsius |
| Humidity range | 10 to 85% non-condensing |
| Operating altitude | Up to 10,000 feet (3048 m) |
| Network protocols supported | TCP/IP, DHCP, ICMP, SNMPv3, HTTPS, Telnet, SSH, LDAP, RADIUS, TACACS+ |
| Management protocols supported | SNMP, HTTP, HTTPS, Telnet, SSH, CLI |
| Certifications | FCC Part 15 (CFR 47) Class B, ICES-003 Class B, EN55022 Class B, CISPR22 Class B, AS/NZS 3548 Class B, VCCI Class B |
| Warranty | 90-day hardware warranty, 1-year software warranty |
| Supported software | Cisco IOS Software Release 12.4(24)T, Cisco Unified Communications Manager Express 7.1 and later versions |
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