Cisco IP Phone & Accessories Cisco CP-7861-K9=

About the product

Sixteen line and programmable keys offers quick access to features and staff
High-resolution, graphical, grayscale display for easier viewing
Dedicated fixed keys^** for more efficient communications
Built-in speakerphone enables hands-free communication
Wideband audio enhances clarity when using a handset, speaker or a headset
Flexible deployment options include Cisco on-premises, hosted, and Webex Calling
Cisco Expressway enables remote workers single sign-on access without a VPN client
Power over Ethernet (PoE) Class 1 and Cisco EnergyWise to help reduce energy costs
Integrated IEEE 10/100 switch to cut installation costs
Cisco Webex Phone OS consolidates administration with common software to both the IP Phone 7800 Series and IP Phone 8800 Series

Description
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Cisco CP-7861-K9= IP Telephone

The Cisco 7861 is part of Cisco’s 7800 Series IP Phones. It’s built for users with high call volumes (e.g. contact centre agents, administrative staff, managers) and offers a lot of programmable line/feature keys.

Key Features

Lines & Programmable Keys: Supports 16 programmable line buttons for multiple concurrent calls or extensions with additional fixed keys for functions such as directory, messaging, speakerphone, etc.
Display: 3.5‑inch monochrome (grayscale) backlit display, resolution: 396 × 162 pixels.
Audio Quality: Wideband audio support (e.g. codec G.722) across handset, headset, and speakerphone and Full‑duplex speakerphone.
Network & Connectivity: Dual Ethernet ports: includes an integrated switch to connect both the phone and a PC via the phone. Ethernet speed: 10/100 Mbps.
Power / Energy Efficiency: Supports Power over Ethernet (PoE) — IEEE 802.3af, Class 1 compatibility with optional AC‑to‑DC power supply when PoE is unavailable and Cisco EnergyWise support (helps with energy savings) in some deployments.
Fixed Function/Usability Features: Dedicated buttons for features like conference, directory, messaging, navigation. Replaceable bezel (frame) options (e.g. silver or black) to match decor. Two‑position footstand; also wall‑mountable.
Common Calling & Telephony Features: Supports standard telephony features: call forward, call pickup, call park, transfer, hold/resume, voicemail, mute, speed‑dial, caller ID, redial, etc. Advanced features: Busy Lamp Field (BLF), auto‑answer, headset auto‑detect, “agent greeting,” etc.
Security / Protocols: SIP signalling protocol support for secure signalling (TLS), media encryption (SRTP) in many deployments.
Environmental / Physical: Operating temperature roughly 0‑40 °C. Size and weight: ~207 × 265 × 28 mm (without stand); about 1.05 kg weight.

Cisco IP Phone 7821, 7841, and 7861 User Guide for Cisco Unified Communications Manager 10.0 (SIP)

1 – Handset light strip	2 – Phone screen	3 – Softkey buttons	4-Programmable feature buttons
5 – Navigation and Select button	6 – Hold/Resume button	7- Conference button	8 – Transfer button
9 – Speakerphone button	10 – Headset button	11 – Mute button	12 – Keypad
13 – Volume button	14 – Contacts button	15 – Applications button	16 – Messages button
17- Handset

Advantages

Lots of programmable lines / feature keys → great for power users, receptionists, those handling many simultaneous calls.
Good audio quality, wideband, full duplex speakerphone.
PoE support simplifies cable/power setup.
Flexible mounting & bezel choices.
Strong security features.

Limitations / Considerations

Ethernet is 10/100 in many versions; not gigabit throughput, so if large amounts of data through the phone (PC pass‑through etc.) that might be a bottleneck.
Monochrome display (not colour) → less “flashy” UI, but functional.
Relatively heavy / large footprint compared to smaller desktop phones.
Price might be higher compared to simpler phones with fewer features.