Documented specifications
Cisco · Current manufacturer catalogue evidence; future support end date not confirmed
| Specification | Documented value |
|---|---|
| Display | 3.5-inch backlit grayscale LCD, 384 × 160 Source ↗ |
| Physical line keys | 4 Source ↗ |
| Ethernet | Two-port 10/100/1000 Ethernet switch Source ↗ |
| Power | IEEE PoE class 2; local adapter option Source ↗ |
| USB-A output | 1.25 W under PoE; 2.5 W with Cisco Power Adapter 3 Source ↗ |
| Wi-Fi / Bluetooth | Not listed for 9841; radio features are assigned to 9861/9871 Source ↗ |
| Codecs | Includes Opus, G.722 and G.711 Source ↗ |
Unlisted fields remain unverified. Platform compatibility and remaining support life require confirmation for the exact ordered model.
Why consider it
The 9841 is a candidate for a desk that values physical controls and a wired connection over a color screen. Four physical line keys create a clear limit for workflows that need many colleagues visible at once.
Reasons to consider another model
Choose a different configuration if your requirements include built-in Wi-Fi, a color display or a large receptionist key layout. Do not transfer specifications from the 9861 or 9871 to this model. Its USB accessory power allowance also changes with the power source.
Platform qualification
Cisco lists Asterisk among the 9800 series interoperability platforms. That manufacturer statement does not prove every feature on your installed PBX release. Record PhoneOS, PBX version and the exact feature list, then test registration, transfer, message waiting and headset control.
Lifecycle and ordering
The 9841 appears in Cisco's March 2026 datasheet with orderable part numbers. This establishes current catalogue evidence, not stock availability or a promised support end date. Verify the SKU, supplied power accessories and service agreement before purchase. No VoIP.info hardware testing is claimed.
Sources & applicability
Primary references for the technical details above. Operational examples and planning checklists are VoIP.info editorial guidance.