Updated version of Yealink SIP phone SIP-T21, which perfectly combines style, high quality design and advanced technical solutions. The phone is a budget model and will be perfect for small and medium-sized businesses. Unlike its predecessor, the new model has improved voice quality, screen backlighting and on-screen programmable button captions have been added, and the signaling buttons have become two-color, which is convenient to use in BLF mode.
| Features / filters | |
| AC adapter included | Yes |
| AC adapter input voltage | 100 - 240 |
| AC adapter output current | 0.6 |
| AC adapter output voltage | 5 |
| Anonymous call | Yes |
| Anonymous call rejection | Yes |
| Cables included | LAN (RJ-45) |
| Call forwarding | Yes |
| Call hold | Yes |
| Call park | Yes |
| Call transfer | Yes |
| Call waiting | Yes |
| Caller ID | Yes |
| Comfort noise generation (CNG) | Yes |
| Conference call | Yes |
| Depth | 188 |
| Device lock | Yes |
| Display | LCD |
| Display diagonal | 5.84 |
| Display resolution | 132 x 64 |
| Do not disturb function | Yes |
| Dual-Tone Multi-Frequency (DTMF) modes | In-band, Out-of band, SIP info |
| Ethernet LAN | Yes |
| Ethernet LAN (RJ-45) ports | 2 |
| Front camera | No |
| Full duplex | Yes |
| Handset type | Wired handset |
| Height | 150 |
| Input frequency | 50 - 60 |
| Integrated voicemail | Yes |
| Manual | Yes |
| Message-waiting indicator (MWI) | Yes |
| Microphone mute | Yes |
| Mounting | Desk/Wall |
| Networking standards | IEEE 802.1Q,IEEE 802.1p,IEEE 802.1x |
| Noise reduction | Yes |
| Number of function keys | 6 |
| Number of handles included | 1 |
| Number of programmable keys | 9 |
| Operating relative humidity (H-H) | 10 - 95 |
| Operating temperature (T-T) | -10 - 50 |
| Package depth | 200 |
| Package height | 121 |
| Package weight | 1.1 |
| Package width | 215 |
| Phonebook capacity | 1000 |
| Product colour | Black, Gold |
| Product type | IP Phone |
| Quality of Service (QoS) support | Yes |
| RJ-9 ports quantity | 2 |
| Security algorithms | AES,MD5,SRTP |
| Short Message Service (SMS) | Yes |
| Speed dialling | Yes |
| Syslog | Yes |
| Touchscreen | No |
| Voice activity detection | Yes |
| Voice codecs | G.711,G.722,G.723.1,G.726,G.729ab,iLBC |
| Wall mountable | Yes |
| Width | 209 |
| General Specifications | |
| Audio functions | HD voice: HD handset, HD speaker Wideband codec: AMR-WB (optional), Opus, G. 722 Narrowband codec: G. 711( A / µ), G. 729AB, G. 726, iLBC DTMF: in-band, out-of-band (RFC 2833) and SIP INFO Full-duplex speakerphone with AEC VAD, CNG, AEC, PLC, AJB, AGC |
| Phone Features | 2 VoIP accounts Call hold, mute, DND One-touch speed dialling, hotline Call forward, call waiting, call transfer Group listening, SMS, emergency call Redial, call return, auto answer 3-way local conferencing Direct IP connection without SIP proxy server Ringtone selection/import/delete Set time of day manually or automatically Dial plan XML browser, action URL / URI Integrated screenshots RTCP-XR, VQ-RTCPXR Enhanced DSS key |
| Catalogue | Loal phone book with up to 1000 entries Blacklist XML / LDAP remote phonebook Smart dial Phone book search/import/export Call history: dialed/received/missed/forwarded |
| IP-PBX features | Busy Lamp Field (BLF) Bridged Line Apperance (BLA) Anonymous call, Anonymous reject Hot-desking, voice mail Flexible seating Call park, call pickup Supervisor and Assistant Centralised call recording Visual voicemail Call recording |
| Display and indicator | Graphic LCD 132 x 64 pixels with backlight LED indicating calls and messages waiting Bicolour (red or green) backlit LED for line status information Intuitive user interface with icons and soft keys Multilingual user interface Caller ID with name and number |
| Function keys | 2 Line keys with LED 6 Function keys: Message, headset, redial, transfer, mute, speakerphone 6 navigation keys Volume control keys |
| Interface | 2 x Ethernet RJ45 10/100M ports Power over Ethernet (IEEE 802.3 af), class 2 (T21P E2) 1 x Headset port RJ9 (4P4C) 1 x RJ9 headset port (4P4C) |
| Management | Configuration: browser / phone / auto start Auto-sharing via FTP/TFTP/HTTP/HTTPS for mass installation Auto-provisioning with PnP Zero-sp-touch, TR-069 Phone lock for privacy protection Reset to factory default, reboot Export packet trace, system log |
| Network and security | SIP v1 (RFC2543), v2 (RFC3261) Call server redundancy supported NAT traversal: STUN mode Proxy and SIP peer-to-peer link mode IP assignment: static / DHCP HTTP/HTTPS web server Time and date synchronization via SNTP UDP / TCP / DNS-SRV (RFC 3263) QoS: 802.1 p/Q tagging (VLAN), Layer 3 TOS DSCP SRTP for voice Transport Layer Security (TLS) HTTPS certificate manager AES encryption for configuration file Digest authentication OpenVPN, IEEE802.1x IPv6 LLDP/CDP / DHCP VLAN ICE |
| Other Physical Characteristics | |
| Color: | Black |
| Assembly: | Wall-mountable |
| Yealink external power adapter: | AC input 100~240V and DC output 5V/600mA |
| Power consumption (power supply): | 0,8-1,4 W |
| Power consumption (PoE): | 1,3 - 1,8 W (T21P E2) |
| Dimensions (W * D * H * T): | 209 mm * 188 mm * 150 mm * 41 mm |
| Operating humidity: | 10~95% |
| Operating temperature: | -10~50°C (+14~122°F) |
There is no PoE power capability on this phone.
