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Search, shortlist two to four phones, then compare specifications and source evidence.
Compare essentials or all specifications. Unknown values stay visible when showing differences.
How to read this comparison
SIP accounts are registrations, not simultaneous calls. Programmable keys count assignable positions across pages, not just physical buttons. Conference capacity and encryption depend on firmware and configuration.
No is an explicit negative; Unknown means unresolved evidence; Not applicable means the field does not apply. An optional adapter is an extra accessory. Open Evidence for model scope, source sections and qualifications.
Differences keep your selected requirements and unknowns visible. Equal headline values can remain when their evidence notes differ.
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| Specification | Yealink SIP-T42U 10 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-09 Selected requirements: 2 met · 0 not met · 0 unknown | AudioCodes 445HD 9 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 Selected requirements: 2 met · 0 not met · 0 unknown |
|---|---|---|
| Calling | ||
| SIP accounts / linesDifference | 12EvidenceManufacturer page Yealink SIP-T42U product specificationsSection: Technical specifications; SIP accounts / line support Evidence reviewed: 2026-09-09 Applies to: Yealink SIP-T42U, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Programmable keysDifference | Unknown | 6EvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > 6 programmable multi-function keys; excludes 12 sidecar speed-dial keys Evidence reviewed: 2026-09-29 |
| Local conference participantsDifference | Unknown | Unknown |
| Display | ||
| Display sizeDifference | 2.7 inEvidenceManufacturer page SIP-T42U technical specificationsSection: Technical specifications; Display / LCD Evidence reviewed: 2026-09-09 Applies to: Yealink SIP-T42U, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | 4.3 inEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > Graphic 4.3-inch colour LCD screen Evidence reviewed: 2026-09-29 |
| Display resolutionDifference | 192 × 64EvidenceManufacturer page SIP-T42U technical specificationsSection: Technical specifications; Display / LCD Evidence reviewed: 2026-09-09 Applies to: Yealink SIP-T42U, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | 480 x 272EvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > Graphic 4.3-inch colour LCD screen (480x272) Evidence reviewed: 2026-09-29 |
| Colour displayDifference | Unknown | YesEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > Graphic colour LCD screen Evidence reviewed: 2026-09-29 |
| TouchscreenDifference | Unknown | Unknown |
| Connectivity | ||
| EthernetDifferenceRequired: Gigabit | Meets requirementGigabitEvidenceManufacturer page SIP-T42U technical specificationsSection: Technical specifications; Network interfaces Evidence reviewed: 2026-09-09 Applies to: Yealink SIP-T42U, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Meets requirementGigabitEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > GbE Support Evidence reviewed: 2026-09-29 |
| Power over EthernetDifferenceRequired: Yes | Meets requirementYesEvidenceManufacturer page Yealink SIP-T42U product specificationsSection: Technical specifications; Power supply / Power over Ethernet Evidence reviewed: 2026-09-09 Applies to: Yealink SIP-T42U, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Meets requirementYesEvidenceManufacturer specification 445HD IP PhoneSection: IP Phone Series Highlights > PoE or external power supply Evidence reviewed: 2026-09-29 |
| Wi-FiDifference | Optional adapterEvidenceManufacturer page Yealink SIP-T42U product specificationsSection: Technical specifications; Wi-Fi / wireless connectivity Review note: Requires an optional WF40/WF50 USB Wi-Fi adapter. Evidence reviewed: 2026-09-09 Applies to: Yealink SIP-T42U, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Wi-Fi standardDifference | Unknown | Unknown |
| BluetoothDifference | Optional adapterEvidenceManufacturer page SIP-T42U technical specificationsSection: Technical specifications; Bluetooth / accessories Review note: Requires an optional compatible Yealink USB Bluetooth adapter; it consumes a USB port. Evidence reviewed: 2026-09-09 Applies to: Yealink SIP-T42U, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Bluetooth versionDifference | Unknown | Unknown |
| USB portsDifference | 2EvidenceManufacturer page SIP-T42U technical specificationsSection: Technical specifications; USB interfaces Evidence reviewed: 2026-09-09 Applies to: Yealink SIP-T42U, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Accessories | ||
| Headset interfacesDifference | Unknown | USBEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > USB headset support; other connector paths not assumed Evidence reviewed: 2026-09-29 |
| Expansion modulesDifference | Unknown | Unknown |
| Physical | ||
| Wall mountableDifference | YesEvidenceManufacturer page Yealink SIP-T42U product specificationsSection: Technical specifications; wall mountable Evidence reviewed: 2026-09-09 Applies to: Yealink SIP-T42U, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Audio | ||
| HD voiceDifference | YesEvidenceManufacturer page Yealink SIP-T42U product specificationsSection: Technical specifications; Audio features Evidence reviewed: 2026-09-09 Applies to: Yealink SIP-T42U, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | YesEvidenceManufacturer specification 445HD IP PhoneSection: 445HD hero features > HD voice with SILK vocoder Evidence reviewed: 2026-09-29 |
| Full-duplex speakerphoneDifference | Unknown | YesEvidenceManufacturer specification 445HD IP PhoneSection: IP Phone Series Highlights > Full duplex speaker phone Evidence reviewed: 2026-09-29 |
| Audio codecsDifference | Unknown | Unknown |
| Software | ||
| Operating systemDifference | Unknown | Unknown |
| Security | ||
| TLS signallingDifference | Unknown | Unknown |
| SRTP media encryptionDifference | Unknown | Unknown |
Compatible phone systems
The indicator shows whether a compatible configuration path is documented, or whether the result still needs verification. A not-listed result does not mean technically incompatible. It does not replace checking the provider firmware branch, tenant, network and feature requirements.
3CX V20
Listed firmware applies to 3CX V20. Cloud or remote phones need a router phone or SBC. Recheck the current provider release before deployment.
Not reviewed
Not reviewed
Zoom Phone
Yealink phones require Zoom-specific firmware. A certification entry does not confirm every feature or regional deployment.
Not reviewed
Not reviewed
Microsoft Teams SIP Gateway
This is SIP Gateway compatibility, not native Teams-phone certification. Use the gateway provisioning path and approved firmware; confirm tenant licensing, policies and network requirements.
Not reviewed
Not reviewed
Specifications may vary by region, hardware revision, firmware, or optional accessory. A review date or recorded field is not a compatibility guarantee. Follow each product’s official sources before purchasing or deploying.
103 phones found
Unknown means not yet verified, not No.
Before choosing a phone
Treat this comparison as a research aid, not a compatibility or purchasing guarantee. Confirm regional variants, firmware support, platform certification, power requirements, accessories, lifecycle status, and current availability with the manufacturer and your phone-system provider.