Cisco IP Conference Phone 8831 — modular conference phone for Cisco-based meeting rooms
Cisco UCMBase + control unitUp to 106 m² roomsExpandable mics
The Cisco Unified IP Conference Phone 8831 (CP-8831-EU-K9) is a modular conference phone made of a table speaker base and a separate wired control unit with dial pad and display, designed for medium and large meeting rooms up to 106 m² that use Cisco Unified Communications Manager or other Cisco call control.
Four hemi-cardioid microphones give 180° pickup around the base, and a two-element speaker delivers full-duplex wideband audio. Rooms can be extended with wired or DECT wireless expansion microphones, and two bases can be daisy-chained for long boardroom tables.
Before you order: This EU-K9 version is for Cisco call control (Unified CM 8.5(1) and later, UCME 10.0+, Business Edition, HCS). For third-party SIP platforms Cisco sells a separate CP-8831-3P model. Cisco has announced end of sale for the 8831, so plan accessories and spares accordingly.
What's in the Box
- Cisco 8831 base speaker unit
- Detachable wired control unit (DCU) with display and dial pad
What It Means in Practice
- The control unit sits in front of the chair person while the base stays in the middle of the table.
- PoE (802.3af Class 3) powers the phone from the network switch; a local Cisco power cube is optional.
- Add up to two wired or two DECT wireless microphones (separate kits) for long tables.
- Daisy-chaining two bases needs the Cisco daisy-chain cable and the power cube.
What Will Not Work
- It does not register on generic third-party SIP servers — that requires the CP-8831-3P model.
- Expansion microphones, daisy-chain cable and the power cube are not included.
- It has a 10/100 network port and no PC pass-through port.
- It is a voice conference phone, not a video device.
Key Features
180° pickup
Four hemi-cardioid microphones evenly cover the listening area.
Wideband audio
Full-duplex G.722 HD voice, 160 Hz–20 kHz speaker.
Expandable
Optional wired (approx. 2 m) or DECT (up to approx. 90 m) microphones; daisy-chain two bases.
Separate control unit
3.5-inch backlit display and dial pad on its own cable.
Technical Specifications
| Identification |
| Part Number |
CP-8831-EU-K9 |
| EAN / GTIN |
0882658794162 |
| Brand |
Cisco |
| Model |
Unified IP Conference Phone 8831 |
| Platform |
| Call control |
Cisco Unified CM 8.5(1)+, BE 3000/6000, UCME 10.0+, HCS |
| Signalling |
SIP |
| Codecs |
G.711, G.729a/ab, G.722, iLBC |
| Security |
TLS, SRTP AES-128 |
| Audio |
| Microphones |
4x hemi-cardioid, 180° pickup |
| Speaker |
Two-element, 92 dB SPL, 160 Hz–20 kHz |
| Room size |
Up to 106 m² (1,140 sq ft) |
| Hardware |
| Display |
3.5-inch backlit monochrome, 396 x 162 |
| Network |
10/100 Ethernet |
| Power |
PoE IEEE 802.3af Class 3 · optional Cisco Power Cube 3 |
| Base dimensions |
264 x 264 x 51 mm, 1.6 kg |
| Control unit dimensions |
146 x 127 x 25 mm |
| Warranty |
| Warranty |
1-Year Warranty (Singular) |
| Manufacturer Term |
1-year limited hardware replacement warranty per Cisco — claims handled through Singular |
Frequently Asked Questions
Can I use it with 3CX or another SIP PBX?
No. This EU-K9 version is for Cisco call control; the CP-8831-3P model is for third-party SIP.
How is it powered?
By PoE 802.3af Class 3 from the switch, or with the optional Cisco Power Cube 3 and EU cord.
Can I add microphones?
Yes, up to two wired or two DECT wireless expansion microphones (sold separately).
Singular Expert Insight · Buyer's Guide
The 8831 remains a solid choice for extending or replacing conference phones in an existing Cisco UCM estate, especially where its expansion microphones are already in use. Make sure the room switch port provides PoE — see our
PoE switches.
✓ Buy it if your company runs Cisco Unified CM or UCME and you need a conference phone for a medium or large room.
✕ Skip it if you use a third-party SIP platform or Microsoft Teams, or you need a long-term current model.
→ Also consider the CP-8831-3P version for third-party SIP call control.
Not sure it will register on your system? Send us your call-control platform and version and we will check before you order.