Yealink SIP-T22P

Audio Features: 
- HD voice: HD handset, HD speaker 
- Wideband codec: G.722 
- Narrowband codec: G.711(A/μ), G.723.1, G.729AB, 
- G.726, iLBC 
- DTMF: In-band, Out-of-band(RFC 2833) and SIP 
INFO 
- Full-duplex hands-free speakerphone with AEC 

Phone Features 
- 3 SIP accounts 
- Call hold, mute, DND 
- One-touch speed dial, hotline 
- Call forward, call waiting, call transfer 
- Group listening, SMS 
- Redial, call return, auto answer 
- Local 3-way conferencing 
- Direct IP call without SIP proxy 
- Ring tone selection/import/delete 
- Set date time manually or automatically 
- Dial plan 
- XML Browser