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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-T33G 14 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-07 Selected requirements: 0 met · 0 not met · 2 unknown | AudioCodes 425HD 7 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 Selected requirements: 0 met · 0 not met · 2 unknown |
|---|---|---|
| Calling | ||
| SIP accounts / linesDifference | 4EvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Phone Features Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Programmable keysDifference | 12EvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Feature keys Review note: Assignable DSS positions across pages; four physical line keys. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | 8EvidenceManufacturer specification 425HD IP PhoneSection: 425HD overview > 8 programmable multi-function keys Evidence reviewed: 2026-09-29 |
| Local conference participantsDifference | 5EvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Phone Features Review note: Documented phone conference capacity; verify supported firmware and calling configuration. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Display | ||
| Display sizeDifference | 2.4 inEvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Display and Indicator Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | 3.5 inEvidenceManufacturer specification 425HD IP PhoneSection: 425HD overview > 3.5-inch colour display Evidence reviewed: 2026-09-29 |
| Display resolutionDifference | 320 x 240EvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Display and Indicator Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Colour display | YesEvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Display and Indicator Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | YesEvidenceManufacturer specification 425HD IP PhoneSection: 425HD overview > colour display Evidence reviewed: 2026-09-29 |
| TouchscreenDifference | Unknown | Unknown |
| Connectivity | ||
| EthernetDifference | GigabitEvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Interface Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Power over EthernetDifference | YesEvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Interface Review note: 802.3af; the class 1 footnote applies only to units labelled V2 or later. Check the unit label and switch power budget. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | YesEvidenceManufacturer specification 425HD IP PhoneSection: 400HD IP Phone Series Highlights > PoE or external supply Evidence reviewed: 2026-09-29 |
| Wi-FiDifferenceRequired: Built in | Needs verificationUnknown | Needs verificationUnknown |
| Wi-Fi standardDifference | Unknown | Unknown |
| BluetoothDifferenceRequired: Built in | Needs verificationUnknown | Needs verificationUnknown |
| Bluetooth versionDifference | Unknown | Unknown |
| USB portsDifference | Unknown | Unknown |
| Accessories | ||
| Headset interfacesDifference | RJ9, EHS (adapter)EvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Interface; page 1 introduction Review note: EHS35 is listed for Yealink wireless headsets. Verify the exact headset and cable combination. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | USBEvidenceManufacturer specification 425HD IP PhoneSection: 425HD Wired Connectivity > USB headset support Evidence reviewed: 2026-09-29 |
| Expansion modulesDifference | Unknown | Unknown |
| Physical | ||
| Wall mountableDifference | YesEvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Other Physical Features Review note: Check mounting parts and local wall-plate fit. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Audio | ||
| HD voice | YesEvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Audio Features Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | YesEvidenceManufacturer specification 425HD IP PhoneSection: 425HD Amazing Sound > HD voice quality Evidence reviewed: 2026-09-29 |
| Full-duplex speakerphone | YesEvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Audio Features Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | YesEvidenceManufacturer specification 425HD IP PhoneSection: 400HD IP Phone Series Highlights > full duplex speakerphone Evidence reviewed: 2026-09-29 |
| Audio codecsDifference | UnknownEvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Audio Features Review note: The reviewed document reverses PCMA/PCMU G.711 labels and omits a wideband list. A complete codec list remains unresolved. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Software | ||
| Operating systemDifference | Unknown | Unknown |
| Security | ||
| TLS signallingDifference | YesEvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Network and Security Review note: Protocol capability only. Verify supported firmware, cipher settings and provider configuration. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| SRTP media encryptionDifference | YesEvidenceManufacturer specification Yealink SIP-T33G datasheetPage: 2 Section: Network and Security Review note: Protocol capability only. Verify supported firmware and provider media-encryption configuration. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T33G, configuration documented in this datasheet; regional availability and provider certification are unverified. | 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.
Compatible path documented Provisioning documented
Evidence reviewed: 2026-09-08
Provider-listed firmware: 124.87.0.20
Sources and scope
Yealink SIP-T33G. Provider documentation only. Regional availability, hardware revisions and headset combinations remain unverified. No tenant or device was tested.
- 3CX Yealink T3 configuration
Exact-model heading and provisioning instructions
- 3CX V20 phone firmware
Phone Firmware table; exact model row; V20 scope note
Not reviewed
Zoom Phone
Yealink phones require Zoom-specific firmware. A certification entry does not confirm every feature or regional deployment.
Compatible path documented On certified hardware list
Evidence reviewed: 2026-09-08
Provider-listed firmware: 124.87.3.2
Provider firmware date: 2026-07-19
Sources and scope
Yealink SIP-T33G. Provider documentation only. Regional availability, hardware revisions and headset combinations remain unverified. No tenant or device was tested.
- Zoom Phone certified hardware
Desk phones > Yealink; exact model rows; Yealink custom firmware required
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.
Compatible path documented On SIP Gateway list
Evidence reviewed: 2026-09-08
Gateway-approved firmware: 124.86.0.147
Minimum firmware as listed: 83
Sources and scope
Yealink SIP-T33G. Provider documentation only. Regional availability, hardware revisions and headset combinations remain unverified. No tenant or device was tested.
- Microsoft Teams SIP Gateway plan
Compatible devices > Yealink; Minimum firmware version and Approved firmware version columns
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.
49 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.