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HG529MDHP T23G > Yealink HD Voice 
> Dual-port Gigabit Ethernet
> PoE support
> 132x64-pixel graphical LCD
> Up to 3 SIP accounts
> Supports Dual-color LEDs 
> Headset support
> Wall mountable
> IPv6 support

> 3 SIP accounts
> Call hold, mute, DND
> One-touch speed dial, hotline 
> Call forward, call waiting, call transfer

HG523MDHP T21p
> Yealink HD Voice 
> 132x64-pixel graphical LCD 
with backlight
> Two-port 10/100M Ethernet Switch 
> PoE support
> Up to 2 SIP accounts
> Headset support
> Wall mountable
> Simple, flexible and secure
provisioning options

HG526MDHP T19p
> 1 VoIP account
> Call hold, mute, DND
> One-touch speed dial, hotline
> Call forward, call waiting, call transfer
> Group listening, SMS
> Redial, call return, auto answer
> Local 3-way conferencing
> Direct IP call without SIP proxy