- Yealink Optima HD Voice
- Codecs: Opus G.722 G.711 (A/u) G.723.1 G.729AB G.726
- Display: 2.7" 192x64 pixel graphical LCD with backlight
- Up to 6 SIP accounts
- 6 Line keys with dual color LEDs can be programmed with up to 15 features (3 page view)
- 4 Soft Keys
- Paper label-free design
- One RJ9 headset port with EHS support (with EHS36 wireless headset adapter)
- Wall mountable with WMB-T4S kit
- Two 10/100M Ethernet ports
- PoE 802.3af class 2
- No power supply included (PS5V1200US)
- Upgrades from T41P
- Device performance enhancement with faster response on the phone's user interface
- Opus support
- Enhanced speaker performance
- USB port for Bluetooth headset with BT40 dongle or WiFi support with WF40 dongle
- United firmware
- Hearing aid compatible handset
- Codecs: Opus G.722 G.711 (A/u) G.723.1 G.729AB G.726
- Display: 2.7" 192x64 pixel graphical LCD with backlight
- Up to 6 SIP accounts
- 6 Line keys with dual color LEDs can be programmed with up to 15 features (3 page view)
- 4 Soft Keys
- Paper label-free design
- One RJ9 headset port with EHS support (with EHS36 wireless headset adapter)
- Wall mountable with WMB-T4S kit
- Two 10/100M Ethernet ports
- PoE 802.3af class 2
- No power supply included (PS5V1200US)
- Upgrades from T41P
- Device performance enhancement with faster response on the phone's user interface
- Opus support
- Enhanced speaker performance
- USB port for Bluetooth headset with BT40 dongle or WiFi support with WF40 dongle
- United firmware
- Hearing aid compatible handset