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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.
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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-T44U 19 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-07 | AudioCodes C450HD 9 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 |
|---|---|---|
| Calling | ||
| SIP accounts / linesDifference | 12EvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Phone Features Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Programmable keysDifference | 21EvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Feature keys Review note: Assignable DSS positions across pages; eight physical line keys. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | 8EvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > up to 8 programmable on-screen keys Evidence reviewed: 2026-09-29 |
| Local conference participantsDifference | 5EvidenceManufacturer specification Yealink SIP-T44U 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-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Display | ||
| Display sizeDifference | 2.8 inEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Display and Indicator Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | 5 inEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > 5-inch colour TFT screen Evidence reviewed: 2026-09-29 |
| Display resolutionDifference | 320 x 240EvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Display and Indicator Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | 1280 x 720EvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > 1280 x 720 screen Evidence reviewed: 2026-09-29 |
| Colour display | YesEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Display and Indicator Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | YesEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > colour TFT screen Evidence reviewed: 2026-09-29 |
| TouchscreenDifference | Unknown | YesEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > touch screen interface Evidence reviewed: 2026-09-29 |
| Connectivity | ||
| Ethernet | GigabitEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Interface Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | GigabitEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > GbE support Evidence reviewed: 2026-09-29 |
| Power over EthernetDifference | YesEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Interface Review note: 802.3af class 3; check the switch power budget. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | YesEvidenceManufacturer specification C450HD IP PhoneSection: IP Phone Series Highlights > PoE or external supply Evidence reviewed: 2026-09-29 |
| Wi-FiDifference | Optional adapterEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Phone Features Review note: WF40 or WF50 required; consumes a USB port. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Wi-Fi standardDifference | UnknownEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Phone Features Review note: Depends on the selected Wi-Fi adapter; no single built-in radio standard. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| BluetoothDifference | Optional adapterEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Phone Features Review note: BT40, BT41 or BT51 listed; verify dongle, headset and firmware compatibility. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Bluetooth versionDifference | UnknownEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Phone Features Review note: Depends on the selected Bluetooth adapter; no single built-in radio version. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| USB portsDifference | 2EvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Interface Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Accessories | ||
| Headset interfacesDifference | RJ9, USB, Bluetooth (adapter), EHS (adapter)EvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Interface; Phone Features Review note: EHS40 and Bluetooth dongles are optional. Listed interface support does not certify every headset. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | USBEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > USB headset support Evidence reviewed: 2026-09-29 |
| Expansion modulesDifference | EXP43 (up to 3; optional)EvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Phone Features; page 1 High Expansibility Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Physical | ||
| Wall mountableDifference | YesEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Other Physical Features; Package Features Review note: Wall-mount bracket is optional. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Audio | ||
| HD voiceDifference | YesEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Audio Features Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| Full-duplex speakerphone | YesEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Audio Features Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | YesEvidenceManufacturer specification C450HD IP PhoneSection: IP Phone Series Highlights > full duplex speakerphone Evidence reviewed: 2026-09-29 |
| Audio codecsDifference | G.722, PCMU, PCMA, G.723.1, G.729, G.729A, G.729B, G.729AB, G.726, iLBCEvidenceManufacturer specification Yealink SIP-T44U datasheetPage: 2 Section: Audio Features Review note: AMR-WB and AMR-NB are optional and excluded from this baseline list. Confirm codecs on the provisioned firmware. Evidence reviewed: 2026-09-07 Applies to: Yealink SIP-T44U, 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-T44U 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-T44U, configuration documented in this datasheet; regional availability and provider certification are unverified. | Unknown |
| SRTP media encryptionDifference | YesEvidenceManufacturer specification Yealink SIP-T44U 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-T44U, 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: 108.87.0.26
Also listed for the router-phone role
Sources and scope
Yealink SIP-T44U. Provider documentation only. Regional availability, hardware revisions and headset combinations remain unverified. No tenant or device was tested.
- 3CX Yealink T4 configuration
Exact-model heading; Router Phones; Firmware Requirements
- 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: 108.87.3.1
Provider firmware date: 2026-07-19
Sources and scope
Yealink SIP-T44U. 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.
Needs verification Not on reviewed list
Evidence reviewed: 2026-09-08
Sources and scope
Yealink SIP-T44U. 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.
158 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.