Yealink SIP-T21P User Manual

Table of Contents
ix
Outgoing Intercom Calls .............................................................................................. 103
Incoming Intercom Calls .............................................................................................. 103
Multicast Paging ............................................................................................................... 105
Sending RTP Stream ..................................................................................................... 105
Receiving RTP Stream ................................................................................................... 107
Music on Hold ................................................................................................................... 108
Automatic Call Distribution (ACD).................................................................................. 109
Messages .......................................................................................................................... 111
Short Message Service (SMS) .................................................................................... 111
Voice Mail ...................................................................................................................... 113
Message Waiting Indicator (MWI) ............................................................................. 114
Troubleshooting .....................................................................119
Regulatory Notices ................................................................129
Service Agreements ........................................................................................................ 129
Limitations of Liability ...................................................................................................... 129
Safety Instructions ............................................................................................................ 129
Appendix A - Time Zones ......................................................131
Index ......................................................................................133

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