PoE

For Grandstream phones, models ending in G indicate Gigabit Ethernet, models ending in P indicate PoE, models ending in W indicate WiFi.

For Yealink phones, the T series models ending in G indicate Gigabit Ethernet, models ending in P indicate PoE (most of the newer models support PoE without the P designation), U indicates an updated model, W indicates WiFi and Bluetooth.