Compare desk phones
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Find your next desk phone
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 | Unify OpenScape CP700X 9 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 |
|---|---|---|
| Calling | ||
| SIP accounts / linesDifference | Unknown | Unknown |
| Programmable keys | 6EvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > 6 programmable multi-function keys; excludes 12 sidecar speed-dial keys Evidence reviewed: 2026-09-29 | 6EvidenceManufacturer specification OpenScape CPx00 seriesSection: Features Comparison table, CP700X column, FreeProgrammable keys row; physical LED 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 | 5 inEvidenceManufacturer specification OpenScape CPx00 seriesSection: Features Comparison table, CP700/700x column, Screen row Evidence reviewed: 2026-09-29 |
| Display resolutionDifference | 480 x 272EvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > Graphic 4.3-inch colour LCD screen (480x272) Evidence reviewed: 2026-09-29 | 800 x 480EvidenceManufacturer specification OpenScape CPx00 seriesSection: Features Comparison table, CP700/700x column, Screen row Evidence reviewed: 2026-09-29 |
| Colour display | YesEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > Graphic colour LCD screen Evidence reviewed: 2026-09-29 | YesEvidenceManufacturer specification OpenScape CPx00 seriesSection: Features Comparison table, CP700/700x column, Screen row 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 OpenScape CPx00 seriesSection: Features Comparison table, CP700/700x column, Ethernet ports row 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 OpenScape CPx00 seriesSection: Features Comparison table, CP700/700x column, IEEE 802.3af POE row Evidence reviewed: 2026-09-29 |
| Wi-FiDifference | Unknown | Built inEvidenceManufacturer specification OpenScape CPx00 seriesSection: Features Comparison table, CP700/700x column, Wi-Fi 5 row: CP700X yes, CP700 no Evidence reviewed: 2026-09-29 |
| Wi-Fi standardDifference | Unknown | Unknown |
| BluetoothDifference | Unknown | Built inEvidenceManufacturer specification OpenScape CPx00 seriesSection: Features Comparison table, CP700/700x column, Bluetooth row Evidence reviewed: 2026-09-29 |
| 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 | Unknown |
| Expansion modulesDifference | Unknown | Unknown |
| Physical | ||
| Wall mountableDifference | Unknown | Unknown |
| Audio | ||
| HD voiceDifference | YesEvidenceManufacturer specification 445HD IP PhoneSection: 445HD hero features > HD voice with SILK vocoder Evidence reviewed: 2026-09-29 | Unknown |
| Full-duplex speakerphone | YesEvidenceManufacturer specification 445HD IP PhoneSection: IP Phone Series Highlights > Full duplex speaker phone Evidence reviewed: 2026-09-29 | YesEvidenceManufacturer specification OpenScape CPx00 seriesSection: Features Comparison table, CP700/700x column, Speakerphone row 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.