| HD voice: HD handset, HD speaker |
| Hearing aid compatible (HAC) handset |
| Acoustic Shield |
| Audio codec: Opus, G.722, PCMA, PCMU, G.729A/B, G.726, G.723.1, iLBC |
| DTMF: In-band, Out-of-band (RFC 2833) and SIP INFO |
| Full-duplex hands-free speakerphone with AEC |
| VAD, CNG, AEC, PLC, AJB, AGC |
| Phone Features |
| 12 VoIP accounts |
| Call hold, mute, DND, redial, call return, auto answer |
| One-touch speed dial, call forward, call waiting, call transfer |
| Group listening, hotline, SMS, emergency call |
| 3-way conferencing |
| Direct IP call without SIP proxy |
| Ring tone selection/import/delete |
| Set date time manually or automatically |
| Dial plan, XML Browser, Action URL/URI |
| RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035) |
| Built-in dual band Wi-Fi: |
| – Network standard: IEEE802.11a/b/g/n/ac |
| – Transmission rate: Up to 433Mbps (dynamic) |
| – Frequency range: 2.4GHz/5.0GHz |
| Built-in Bluetooth 4.2 for: |
| – Bluetooth headsets |
| – Contact synchronization |
| – Bluetooth call |
| USB port (2.0 compliant) for: |
| Wired/wireless USB headset |
| USB call recording through USB flash drive |
| Expansion module EXP50 (up to 3) |
| Content Sharing (via Yealink VCD)(1) |
| Enhanced DSS key |
| Directory |
| Local phonebook up to 1000 entries |
| Black list |
| XML/LDAP remote phonebook |
| Smart dialing |
| Phonebook search/import/export |
| Call history: dialed/received/missed/forwarded |
| Corded-Cordless Phone (via DECT Dongle DD10K) |
| Up to 4 DECT cordless handsets |
| Up to 4 concurrent calls |
| Support Yealink W52H/W53H/W56H/DD Phone |
| Slave Handset for Master Deskse |
