| Audio Features | HD voice: HD handset, HD speaker | Hearing aid compatible (HAC) handset | Wideband codec: Opus, G.722 | Narrowband codec: Opus, 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 | VAD, CNG, AEC, PLC, AJB, AGC |
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| Phone Features | 12 VoIP accounts | One-touch speed dial, redial | Call forward, call waiting | Call transfer, call hold | Call return, group listening | Mute, auto answer, DND | 3-way conference call | Direct IP call without SIP proxy | Ring tone selection/import/delete | Hotline, emergency call | Set date time manually or automatically | Dial Plan, XML Browser, Action URL/URI | RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035) | USB port (2.0 compliant) | Enhanced DSS key |
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| 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 |
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| IP-PBX Features | Busy Lamp Field (BLF) | Bridged Line Apperance (BLA) | Anonymous call, anonymous call rejection | Hot-desking, voice mail | Flexible seating | Call park, call pickup | Executive and Assistant | Centralized call recording | Visual voice mail | Call recording |
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| Display and Indicator | 2.7" 192x64-pixel graphical LCD with backlight | LED for call and message waiting indication | Dual-color (red or green) illuminated LEDs for line status information | Intuitive user interface with icons and soft keys | Multilingual user interface | Caller ID with name and number | Power saving |
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| Feature keys | 6 line keys with LED | 6 line keys can be programmed up to 15 paperless DSS keys (3-page view) | 5 features keys: message, headset, mute, redial, hands-free speakerphone | 4 context-sensitive ?soft? keys | 6 navigation keys | 2 volume control keys | Illuminated mute key | Illuminated headset key | Illuminated hands-free speakerphone key |
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| Interface | Dual-port Gigabit Ethernet | Power over Ethernet (IEEE 802.3af), Class 2 | 1 x USB port (2.0 compliant) | 1 x RJ9 (4P4C) handset port | 1 x RJ9 (4P4C) headset port | 1 x RJ12 (6P6C) EHS port |
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| Other Physical Features | Stand with 2 adjustable angles | Wall mountable | External Yealink AC adapter (optional)? AC 100~240V input and DC 5V/1.2A output | Power consumption (PSU): 1.69-5.0W | Power consumption (PoE): 2.47-12.5W | Dimension (W*D*H*T): 212mm*189mm*175mm*54mm | Operating humidity: 10~95% | Operating temperature: -10~50°C |
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| Management | Configuration: browser/phone/auto-provision | Auto provision via FTP/TFTP/HTTP/HTTPS for mass deploy | Auto-provision with PnP | Broadsoft device management | Zero-sp-touch TR-069 | Phone lock for personal privacy protection | Reset to factory, reboot | Package tracing export, system log |
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| Network and Security | SIP v1 (RFC2543), v2 (RFC3261) | Call server redundancy supported | NAT traversal: STUN mode | Proxy mode and peer-to-peer SIP link mode | IP assignment: static/DHCP | HTTP/HTTPS web server | Time and date synchronization using SNTP |UDP/TCP/DNS-SRV(RFC 3263) | QoS: 802.1p/Q tagging (VLAN), Layer 3 ToS DSCP | SRTP for voice | Transport Layer Security (TLS) | HTTPS certificate manager | AES encryption for configuration file | Digest authentication using MD5/MD5-sess | OpenVPN, IEEE802.1X | IPv6 | LLDP/CDP/DHCP VLAN | ICE |
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| Package Features | Package content: Yealink SIP-T42S IP phone | Handset with handset cord | Ethernet Cable (2m CAT5E UTP Cable) | Stand | Quick Start Guide | Power Adapter (Optional) | Wall Mount Bracket (Optional) |
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