Yealink SIP-T22P 
Professional VoIP Phone is this generation device which offers unbiased communication and brings to you enhanced sound quality. This unit supports 3 x VOIP Lines which widens the scope of usage. Blue Backlit LCD Screen of 132 x 64 character gives you proper assistance when you us the device. High Definition Speaker is included which assures high quality audio output and facilitates handsfree operation. Above all the unit is backed up with 12 months guarantee.
With various facilities like Call Hold, Call Waiting, Call Transfer, Call Forward, BLF, Call park, Call pickup, Dial plan, Intercom and Call List you could manage the calls in an effective manner. Other supportive features include DND, 3-Way Conference, Speed Dial and Voicemail. Downloadable Enterprise Phonebook is equipped in this device. All these advanced features allow you to manage the unit in an appropriate manner.
Options such as Auto Answer and Auto Re-Dial simplify your usage. Caller ID gives information about the incoming calls and you could respond to them accordingly. This corded VoIP phone comes with 23 Hard Keys and 2 LEDs Indications and they come in handy during your use. For programmable functions, the unit includes 3 Keys and 4 Text Sensitive Keys. Headset is compatible with this VoIP phone. Message Waiting Indicator, Mute Facility and On Hook Dial are additional option available. It comes with 1x RJ9 headset port and 2x RJ45 Ethernet ports.
Technical Aspects
The unit supports SIP 2.0(RFC3261) protocol and STUN mode NAT traversal. IP assignments featured are DHCP, Static IP and PPPoE. Firmware, configuration, ring tone and phonebook are the featured auto-provisions. QoS includes IEEE 802.1p/q tagging (VLAN) and Layer 3 ToS. This VoIP phone supports In-band DTMF, Out-band DTMF and SIP INFO DTMF. It consists of Proxy mode and peer-to-peer SIP link mode as well. Standard encryption and authentication (MD5 and MD5-sess) is also possible in this device.
The unit features G.711, G.726, G.729AB, G.723.1 as narrowband voice codecs and G.722 as HD Wideband voice code. VAD, CNG, AEC, PLC, AJB and AGC are supported. Yealink SIP-T22P VoIP Phone is a complete unit which offers advanced features and ensures cost efficient operation.
Apart from all these option, the unit supports 3 SIP accounts, Hotline and Emergency call. It consists of MWI, SMS, XML phonebook, Black list and even a Phone lock. You could handle the unit well with Volume adjustment, Rings selection, Tone scheme, Distinctive ring tone, Multi-language, System log export and Admin/User Configuration Mode.
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