Tech specs
Brand
Cisco
Product Line
Cisco Desk Phone
Model
9851
Manufacturer
Cisco Systems
IP Address Assignment
DHCP, Static
IP Telephony Network Ports
2 x Ethernet 10Base-T/100Base-TX/1000Base-T
Network Features
Class 3 PoE
Network Protocols
Cisco Discovery Protocol (CDP), DHCP, DNS, GARP, HTTPS, IPv4, IPv6, Link Layer Discovery Protocol - Media Endpoint Discovery (LLDP-MED), Link Layer Discovery Protocol (LLDP), RTCP, RTP, TFTP, VLAN
Phone Connections
2 x network / RJ-45, Headset jack / RJ-9, USB / 4 pin USB Type A, USB Type-C / 24 pin USB-C
Backlit Display
Yes
Color Support
Color
Display Diagonal Size
3.7 inch
Display Diagonal Size (metric)
9.4 centimetre
Display Languages
Brazilian Portuguese, Catalan, Chinese (simplified), Chinese (traditional), Chinese (Traditional, Hong Kong), Czech, Danish, Dutch, Finnish, French, French Canadian, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, Spanish (Columbia), Swedish, Turkish, UK English, Ukrainian, US English
Display Location
Base
Display Resolution
240 x 480 pixels
Display Type
LCD display
Compatible Platforms
Asterisk, Cisco BroadWorks, Cisco Webex Calling, Cisco Webex Dedicate Instance (DI)
Indicators & Controls
Busy lamp field (BLF), Calendar indicator, Headset, Line status indicator, Mute indicator, Select indicator, Speakerphone indicator, Status
Multiple Conferencing
Yes
Speakerphone
Yes
Voice Codec
G.711µ-law, G.711a-law, G.722, G.722.2, G.729a, G.729b, iLBC, iSAC, Opus
Additional Functions
Call recording, Conference mode, Do not disturb, Kensington security slot, Music on hold, Mute, One button to join (OBTJ), QR code access, Sleep mode
Call Services
Call Forwarding, Call Hold, Call park/pickup, Call Transfer, Call Waiting, Caller ID, Voicemail
Caller ID Type
Caller ID/call waiting
Compatible Software
Cisco Unified Communications Manager, Cisco WebEx
Dialer Location
Base
Integrated Components
Trusted Platform Module (TPM) 2.0
Lines Supported
46 lines
Main Features
Integrated Ethernet switch
Packaged Quantity
1
Placing/Mounting
Desktop
Power Over Ethernet (PoE) Support
Yes
Product Type
VoIP phone
Programmable Buttons
6
Quality of Service
IEEE 802.1Q (VLAN)
Security
EAP-FAST, EAP-TLS, FIPS 140-2, IEEE 802.1X, SRTP, TLS 1.3
Voice Features
Acoustic echo cancellation (AEC), Acoustic shock protection, Adaptive jitter buffer (AJB), Automatic gain control (AGC), Comfort noise generation (CNG), Dual tone multi-frequency (DTMF), Forward error correction (FEC), HD audio, Packet loss concealment (PLC), Silence suppression, Ultrasonic support, Voice activity detection (VAD)
VoIP
Yes
VoIP Protocols
RTCP, RTP, SDP, SIP, SRTP
Volume Control
Yes
Wireless Interface Provided
NFC
Cables
Network cable
Height
4.94 centimetre
Weight
968 gram
Width
22.606 centimetre
Depth
21.424 centimetre
Body Material
74% post-consumer recycled plastic, ABS polycarbonate
Color
Carbon black
Color Category
Black
ENERGY STAR Certified
Yes
EPEAT Compliant
No
TCO Certified
No
Service & Support Details
Limited warranty - replacement - 1 year
Limited Warranty
1 Year
Hearing Aid Compatible
Yes