Product Type | Desk Telephone |
Model | Cisco Desk Phone 9851 |
Color | Carbon Black |
Form Factor | Desktop |
Programmable Buttons Quantity | 46 |
Multiline Operation Capability | Yes |
Lines Supported | 130 for CUCM and Webex DI; 16 for Webex Calling and Open SIP platforms |
Conference Call Capability | Yes |
Voice Mail Capability | Yes |
Speakerphone | Full-duplex |
Caller ID | Yes |
Call Forwarding | Yes |
Call Hold | Yes |
Call Transfer | Yes |
Message Waiting Indicator | Yes |
Status Indicators | Backlit indicator |
Volume Control | Yes |
Display Type | LCD Monitor |
Display Size | 3.7 inches |
Hearing Aid Compatible | Yes |
Weight (Base) | 968 g |
Power Requirements | Power over Ethernet (PoE) |
Cisco Desk Phone 9851, NFC, TAA Compliant, Carbon Black


Key Benefits

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- High line support (up to 130) makes it ideal for complex business environments with high call volume.
- TAA compliance and Mexico-based manufacturing optimize it for use in government and institutional settings.
- Comprehensive communication features combined with PoE simplify integration and reduce infrastructure costs.
Product Overview
The Cisco Desk Phone 9851 offers an advanced telephony experience with support for up to 130 lines on specific platforms and a 3.7-inch color LCD for clear call management. The device includes 46 programmable buttons, a full-duplex speakerphone, and is TAA compliant, making it well-suited for regulated industries. It supports a wide range of voice codecs like OPUS and G.722, with integrated features such as caller ID, call forwarding, voicemail, and conferencing. PoE support enables flexible deployment in enterprise environments. Designed in Carbon Black and made in Mexico, the unit is also hearing-aid compatible and comes with a 1-year limited hardware warranty.
Specifications
Product Overview
Physical & Environmental
Width (Base) | 8.4 inch |
Height (Base) | 8.9 inch |
Depth (Base) | 1.9 inch |
Operating Temperature | 0°C to 40°C (32°F to 104°F) |
Operating Humidity | 10% to 90% (non-condensing) |
Storage Temperature | -10°C to 60°C (14°F to 140°F) |
Storage Humidity | 10% to 95% (non-condensing) |
Cloud Management & Licensing
Supported Platforms | Cisco Unified Communications Manager (CUCM), Webex DI, Webex Calling, Open SIP |
Licensing Model | Per-device or enterprise agreement via Webex or CUCM |
Included Management Interface | Web UI, Remote Management via CUCM/Webex |
Audio Features
Voice Codecs Supported | OPUS, G.722, G.722.2, iSAC, G.711 (a-law/μ-law), G.729a/b, iLBC |
Echo Cancellation | Yes |
Comfort Noise Generation (CNG) | Yes |
Silence Suppression | Yes |
Interfaces
Ethernet Ports | 2 x 10/100/1000BASE-T |
Headset Port | Yes (RJ-9 and USB) |
USB Ports | 2 x USB Type-A |
NFC Support | Yes |
Power Over Ethernet (PoE) Support | Yes |
Compliance & Origin
Country of Origin | Mexico |
TAA Compliant | Yes |
Certifications | CE, FCC Part 15 Class B, ICES-003, UL 60950-1 |
HAC (Hearing Aid Compatible) | Yes |
Advanced Security Features
Secure Signaling and Media Encryption | TLS, SRTP |
802.1X Authentication | Yes |
Device Certificate Management | Yes (L-SCP, manufacturing installed certificate) |
Secure Boot | Yes |
Warranty
Service & Support Type | 1-Year Limited Hardware Warranty |