Yealink SIP-T21P User Manual

Advanced Phone Features
103
Intercom is a useful feature in an office environment to quickly connect with the operator
or the secretary. You can press the intercom key to automatically connect with a remote
extension for outgoing intercom calls, and the remote extension will automatically
answer the incoming intercom calls.
Note
To configure an intercom key via phone user interface:
1. Press Menu->Features->DSS Keys.
2. Select the desired DSS key.
3. Press or , or the Switch soft key to select Intercom from the Type field.
4. Select the desired line from the Account ID field.
5. Enter the remote extension number in the Value field.
6. Press the Save soft key to accept the change or the Back soft key to cancel.
Intercom key is configurable via web user interface at the path DSSKey->Line key.
To place an intercom call:
1. Press the intercom key when the phone is idle.
The phone is automatically connected to the extension specified in the Value field.
2. Press the intercom key again or the Cancel soft key to end the intercom call.
The SIP-T21P IP phone supports automatically to answer an incoming intercom call by
default. The phone automatically plays a warning tone when it receives an incoming
intercom call. In addition, you can enable the phone to mute the microphone when it
automatically answers an incoming intercom call. You can also enable the phone to
Intercom is not available on all servers. Contact your system administrator for more
information.

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