Documented specifications
Yealink · Current manufacturer catalogue evidence at review date; future support end date not confirmed
| Specification | Documented value |
|---|---|
| Display and keys | 5.5-inch 960 × 480 color display; 12 illuminated line keys, up to 60 DSS assignments across five pages Source ↗ |
| SIP accounts | 16 VoIP accounts Source ↗ |
| Network | Dual-port Gigabit Ethernet; built-in dual-band 802.11a/b/g/n/ac/ax Wi-Fi Source ↗ |
| Bluetooth and USB | Built-in Bluetooth 5.0; one USB-A and one USB-C port Source ↗ |
| Signaling and media controls | TLS 1.3 and SRTP support; deployment configuration determines use Source ↗ |
| Provisioning | FTP, TFTP, HTTP or HTTPS auto-provisioning; PnP, TR-069 and Yealink management support Source ↗ |
Unlisted fields remain unverified. Platform compatibility and remaining support life require confirmation for the exact ordered model.
Where the physical-key layout fits
The T85W pairs a 5.5-inch 960 × 480 display with twelve illuminated line keys and five pages of DSS assignments. It is the more conventional physical-key choice in this pair. Confirm that the intended receptionist or desk user can see the required monitored destinations and complete transfers without paging through more keys than expected.
Connectivity and account scope
The manufacturer specifies 16 VoIP accounts, dual-port Gigabit Ethernet, built-in dual-band Wi-Fi through 802.11ax, Bluetooth 5.0 and USB-A plus USB-C ports. Built-in wireless is not evidence that an enterprise WLAN will meet voice roaming or power requirements, and sixteen configured accounts do not establish simultaneous-call or platform capacity.
Security features still need policy
The datasheet lists TLS 1.3, SRTP, HTTPS certificate management, AES-256 configuration-file encryption, 802.1X, WPA2/WPA3, secure boot and a Trusted Execution Environment. These are available controls, not proof of a secure deployment. Verify firmware, certificates, provisioning custody, disabled services and PBX policy on the exact production configuration.
Bounded purchase decision
The official catalogue marks this model as current at review time, but no future support period, merchant availability or price is asserted. Optional AMR codecs, power adapter, wall mount and DD10K-based DECT operation should remain line items rather than assumptions. The manufacturer's emergency-call and dedicated-button descriptions are phone functions, not emergency-service or life-safety certification. No hardware or call-quality test was performed.
Sources & applicability
Primary references for the technical details above. Operational examples and planning checklists are VoIP.info editorial guidance.