Yealink SIP-T21 E2 Administrator's Guide

Configuring Basic Features
171
 Feature Key Synchronization
 Transfer Mode via Dsskey
 Allow Trans Exist Call
 Directed Call Pickup
 Group Call Pickup
 Dialog Info Call Pickup
 Recent Call In Dialing
 ReCall
 Call Number Filter
 Call Park
 Calling Line Identification Presentation (CLIP)
 Connected Line Identification Presentation (COLP)
 Mute
 Intercom
 Call Timeout
 Ringing Timeout
 Send user=phone
 SIP Send MAC
 SIP Send Line
 Reserve # in User Name
 Password Dial
 Unregister When Reboot
 100 Reliable Retransmission
 Reboot in Talking
 Answer By Hand
 USB Recording
 CSTA Control
 Quick Login
 Cloud
Power Indicator LED
Power indicator LED indicates power status and phone status. It is not applicable to
CP860/CP920 IP phones.
There are seven configuration options for power indicator LED:

Yealink SIP-T21 E2 Specifications

General

Brand	Yealink
Model	SIP-T21 E2
Category	IP Phone
Language	English