The Yealink SIP-T46S IP phone supports up to 16 SIP accounts.  It's built with dual-port Gigabit Ethernet.
 
Key Features:
4.3" 480 x 272-pixel color display with backlight
Opus codec support
USB 2.0 
T4S Auto-P template unified
T4S firmware unified
Up to 16 SIP accounts 
Dual-port Gigabit Ethernet
PoE support
Headset, EHS support 
Wi-Fi via WF40
Bluetooth via BT40
USB recording
Supports expansion modules
Stand with 2 adjustable angles
Wall mountable
 
Datasheet