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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 | AudioCodes 445HD 9 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 | VTech VSP736 9 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 |
|---|---|---|
| Calling | ||
| SIP accounts / linesDifference | Unknown | 6EvidenceManufacturer specification VSP736 specification sheetSection: Specification sheet > Phone Features > six SIP registrations Evidence reviewed: 2026-09-29 |
| Programmable keysDifference | 6EvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > 6 programmable multi-function keys; excludes 12 sidecar speed-dial keys Evidence reviewed: 2026-09-29 | 16EvidenceManufacturer specification VSP736 specification sheetSection: Specification sheet > Display, Keys and Indicators > 32 programmable functions across two pages of 16 keys Evidence reviewed: 2026-09-29 |
| Local conference participantsDifference | Unknown | Unknown |
| Display | ||
| Display sizeDifference | 4.3 inEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > Graphic 4.3-inch colour LCD screen Evidence reviewed: 2026-09-29 | Unknown |
| Display resolutionDifference | 480 x 272EvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > Graphic 4.3-inch colour LCD screen (480x272) Evidence reviewed: 2026-09-29 | 206 x 128EvidenceManufacturer specification VSP736 specification sheetSection: Specification sheet > Display, Keys and Indicators > 206 x 128 LCD Evidence reviewed: 2026-09-29 |
| Colour displayDifference | YesEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > Graphic colour LCD screen Evidence reviewed: 2026-09-29 | NoEvidenceManufacturer specification VSP736 specification sheetSection: Specification sheet > Display, Keys and Indicators > white-backlit LCD; monochrome Evidence reviewed: 2026-09-29 |
| TouchscreenDifference | Unknown | Unknown |
| Connectivity | ||
| Ethernet | GigabitEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > GbE Support Evidence reviewed: 2026-09-29 | GigabitEvidenceManufacturer specification VSP736 specification sheetSection: Specification sheet > Interface > dual GigE Ethernet ports Evidence reviewed: 2026-09-29 |
| Power over Ethernet | YesEvidenceManufacturer specification 445HD IP PhoneSection: IP Phone Series Highlights > PoE or external power supply Evidence reviewed: 2026-09-29 | YesEvidenceManufacturer specification VSP736 specification sheetSection: Specification sheet > Interface > Class 3 PoE Evidence reviewed: 2026-09-29 |
| Wi-FiDifference | Unknown | Unknown |
| Wi-Fi standardDifference | Unknown | Unknown |
| BluetoothDifference | Unknown | Unknown |
| Bluetooth versionDifference | Unknown | Unknown |
| USB portsDifference | Unknown | Unknown |
| Accessories | ||
| Headset interfacesDifference | USBEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > USB headset support; other connector paths not assumed Evidence reviewed: 2026-09-29 | 2.5 mm, DECT 6.0EvidenceManufacturer specification VSP736 specification sheetSection: Specification sheet > Interface > DECT 6.0 headset and Audio/Voice > 2.5 mm corded headset jack Evidence reviewed: 2026-09-29 |
| Expansion modulesDifference | Unknown | Unknown |
| Physical | ||
| Wall mountableDifference | Unknown | Unknown |
| Audio | ||
| HD voice | YesEvidenceManufacturer specification 445HD IP PhoneSection: 445HD hero features > HD voice with SILK vocoder Evidence reviewed: 2026-09-29 | YesEvidenceManufacturer specification VSP736 specification sheetSection: Specification sheet > Audio/Voice > HD Voice for receiver and speakerphone Evidence reviewed: 2026-09-29 |
| Full-duplex speakerphone | YesEvidenceManufacturer specification 445HD IP PhoneSection: IP Phone Series Highlights > Full duplex speaker phone Evidence reviewed: 2026-09-29 | YesEvidenceManufacturer specification VSP736 specification sheetSection: Specification sheet > Audio/Voice > full-duplex base speakerphone 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.
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.