Yealink SIP-T21P User Manual

Customizing Your Phone
61
For more information on the valid values of Account field, refer to Replace Rule on
page 56.
4. Click Confirm to add the block out number.
Note
Public telephone networks in countries around the world have a single emergency
telephone number (emergency services number), that allows a caller to contact local
emergency services for assistance when necessary. The emergency telephone number
may differ from country to country. It is typically a three-digit number so that it can be
easily remembered and dialed quickly. Some countries have different emergency
numbers for different emergency services.
You can specify the emergency telephone number on the IP phone for contacting the
emergency services in an emergency situation.
Note
To specify emergency numbers via web user interface:
1. Click on Features->Phone Lock.
2. Enter the emergency number in the Emergency field.
Contact your local phone service provider for available emergency numbers in your
area.
Block out number is configurable via web user interface only.

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