The Yealink SIP-T77U wired IP phone supports up to 16 SIP accounts and features a 7-inch color touchscreen with a resolution of 800 × 480 pixels. Its 84 programmable DSS keys provide quick access to lines and functions. The speakerphone supports full-duplex communication.

For connectivity, it has two Gigabit Ethernet ports with PoE, as well as one USB-A 2.0 port and one USB-C 2.0 port. It supports Wi-Fi and Bluetooth via optional USB adapters, which are not included with the device. Its features are rounded out by the Linux 6.1 operating system and TEE hardware encryption.

• Type: Wired IP phone
• Color: Black
• Display: 7-inch color touchscreen, 800 × 480 pixel resolution
• SIP accounts: Up to 16
• DSS keys: 84 programmable speed-dial keys
• Ethernet ports: 2 Gigabit Ethernet, 10/100/1000 Mbps
• PoE: 802.3af Class 3 support
• USB ports: 1 USB-A 2.0 and 1 USB-C 2.0
• Wi-Fi: Via optional USB adapter
• Bluetooth: Via optional USB adapter
• Audio: Full-duplex speakerphone
• Operating system: Linux 6.1
• Security: TEE hardware encryption