Learn the common and unique features among the three models of the Cisco IP Phone 8800 Series: CP-8841 vs. CP-8851 vs. CP-8861
| Features | CP-8841 | CP-8851 | CP-8861 |
| Screen | 800 x 480 WVGA (5”) | 800 x 480 WVGA (5”) | 800 x 480 WVGA (5”) |
| Touch Screen | No | No | No |
| Ethernet Switch | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps |
| Programmable Line Keys | 5 | 5 | 5 |
| Programmable Soft Keys | 4 | 4 | 4 |
| Fixed Features Keys | 12 | 12 | 12 |
| Mobile Remote Access without a VPN client through Cisco Expressway | Yes | Yes | Yes |
| Handsfree | Yes | Yes | Yes |
| Speakerphone | Yes | Yes | Yes |
| Signaling Protocols | SIP | SIP, Bluetooth | SIP, Bluetooth |
| 802-3AF | Yes | Yes | Yes |
| Wi-Fi | — | — | 802.11a/b/g/n/ac |
| Cisco Intelligent Proximity for Mobile Voice | Yes | Yes | Yes |
| USB Charging | — | 1 Port | 2 Ports |
| Cisco Power | No | No | No |
| DHCP | Yes | Yes | Yes |
| Codecs | G.711a, G.711u, G.729a, G.729b, G.729ab, iSAC and Internet Low Bitrate Codec (iLBC) | G.711a, G.711u, G.729a, G.729b, G.729ab, iSAC and Internet Low Bitrate Codec (iLBC) | G.711a, G.711u, G.729a, G.729b, G.729ab, iSAC and Internet Low Bitrate Codec (iLBC) |
| 802-1p/q | Yes | Yes | Yes |
| Supported Cisco Call Control Platforms | CUCM: 8.5.1 (non-secured mode), 8.6.2, 9.1.2, 10.0 and later Bus. Edition: 8.6.2, 9.1.2, 10.0 and later HCS: 8.6.2 and later Spark Cloud: Requires Spark Phone OS 11.0 or later Third Party Call Control: IP Phone Firmware cp-88xx- 10-3-1-1-3PCC and later | CUCM: 8.5.1 (non-secured mode), 8.6.2, 9.1.2, 10.0 and later Bus. Edition: 8.6.2, 9.1.2, 10.0 and later HCS: 8.6.2 and later Spark Cloud: Requires Spark Phone OS 11.0 or later Third Party Call Control: IP Phone Firmware cp-88xx- 10-3-1-1-3PCC and later | CUCM: 8.5.1 (non-secured mode), 8.6.2, 9.1.2, 10.0 and later Bus. Edition: 8.6.2, 9.1.2, 10.0 and later HCS: 8.6.2 and later Spark Cloud: Requires Spark Phone OS 11.0 or later Third Party Call Control: IP Phone Firmware cp-88xx- 10-3-1-1-3PCC and later |
| UC Manager Encryption Support | Yes | Yes | Yes |
| Headset Port (RJ9) | Yes | Yes | Yes |
| EHH Support (AUX) | — | — | — |
| Electronic Hook Switch (EHS) Support (AUX & USB) | Yes (AUX only) | Yes | Yes |
| Wideband Audio | Yes | Yes | Yes |
| POE Classification | Class 2 | 3 | 4 |
| Key Expansion Module (KEM) Support | — | Up to 2 | Up to 3 |
| External Audio Port | — | — | Yes |
| Integrated Bluetooth | — | Yes | Yes |
Compare Cisco IP Phone 8800 Models: Specifications at a Glance
 | 8811 | 8831 | 8841 | 8845 | 8851 | 8861 | 8865 |
| High-def Video (720p) | No | No | No | Yes | No | No | Yes |
| Integral switch | Gigabit | No | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Programmable (line) keys | 5 | 1 | 5 | 5 | 5 | 5 | 5 |
| Bluetooth/DECT | No | DECT (mics) | No | Bluetooth | Bluetooth | Bluetooth | Bluetooth |
| Cisco Intelligent Proximity | No | No | No | Yes | Yes | Yes | Yes |
| USB (physical ports) | No | No | No | No | Yes (1) | Yes (2) | Yes (2) |
| KEM | No | No | No | No | Yes (2) | Yes (3) | Yes (3) |
| Wi-Fi (802.11n) | No | No | No | No | No | Yes | Yes |
| Wall-mountable | Yes | No | Yes | Yes | Yes | Yes | Yes |
Reference from https://supportforums.cisco.com/document/13123921/comparison-chart-cisco-ip-phone-8800-series
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