Yealink SIP-T21P User Manual

Getting Started
13
After your phone is powered on, the system boots up and performs the following steps:
Automatic Phone Initialization
The phone finishes the initialization by loading the saved configuration. The LCD screen
displays “Initializing…please wait” during this process.
DHCP (Dynamic Host Configuration Protocol)
The phone attempts to contact a DHCP server in your network to obtain valid IPv4 and
IPv6 network settings (e.g., IP address, subnet mask, default gateway address and DNS
address) by default.
Note
You can view phone status via phone user interface or web user interface.
Available information of phone status includes:
 Network status (e.g., IPv4 status, IPv6 status, IP mode and MAC address).
 Phone status (e.g., device model, hardware version, firmware version, product ID,
MAC address and device certificate status: factory, installed and not installed).
 Account status (e.g., the register status of SIP accounts).
To view the phone status via phone user interface:
1. Press , or press Menu->Status.
2. Press or to scroll through the list and view the specific information.
To view the phone status via web user interface:
1. Open the web browser of your computer.
2. Enter the IP address in the browser’s address bar, and then press Enter.
If your network does not use DHCP, proceed to Basic Network Settings on page 14.

Yealink SIP-T21P Specifications

General

Display	132 x 64-pixel graphical LCD
Network	10/100 Mbps Ethernet
SIP Accounts	2
Wall Mountable	Yes
Audio Features	HD Voice
Protocols	SIP v1 (RFC2543), v2 (RFC3261)
Voice Codecs	G.711(A/μ), G.729AB, G.726, G.722
Phonebook	1000 entries
Call Features	Call hold, call waiting, call transfer, call forward, 3-way conferencing
Security	SRTP, TLS, 802.1x, HTTPS
Ethernet Ports	2 x RJ45 10/100 Mbps
Power Supply	Power over Ethernet (PoE) or optional power adapter
Operating Humidity	10% to 90% (non-condensing)
Languages	Supports multiple languages
PoE	Yes (802.3af)
Operating Temperature	-10°C to 50°C