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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 | Mitel 6920w 8 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 Selected requirements: 0 met · 0 not met · 1 unknown | AudioCodes 425HD 7 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 Selected requirements: 0 met · 0 not met · 1 unknown |
|---|---|---|
| Calling | ||
| SIP accounts / linesDifference | Unknown | Unknown |
| Programmable keysDifference | 6EvidenceManufacturer specification Mitel 6900 IP Phone SeriesSection: Features Comparison table, 6920w column, Programmable Keys row; physical keys only Evidence reviewed: 2026-09-29 | 8EvidenceManufacturer specification 425HD IP PhoneSection: 425HD overview > 8 programmable multi-function keys Evidence reviewed: 2026-09-29 |
| Local conference participantsDifference | Unknown | Unknown |
| Display | ||
| Display size | 3.5 inEvidenceManufacturer specification Mitel 6900 IP Phone SeriesSection: Features Comparison table, 6920w column, Display row Evidence reviewed: 2026-09-29 | 3.5 inEvidenceManufacturer specification 425HD IP PhoneSection: 425HD overview > 3.5-inch colour display Evidence reviewed: 2026-09-29 |
| Display resolutionDifference | Unknown | Unknown |
| Colour display | YesEvidenceManufacturer specification Mitel 6900 IP Phone SeriesSection: Features Comparison table, 6920w column, Display row Evidence reviewed: 2026-09-29 | YesEvidenceManufacturer specification 425HD IP PhoneSection: 425HD overview > colour display Evidence reviewed: 2026-09-29 |
| TouchscreenDifference | Unknown | Unknown |
| Connectivity | ||
| EthernetDifference | GigabitEvidenceManufacturer specification Mitel 6900 IP Phone SeriesSection: Network Flexibility section: Dual Gigabit Ethernet Ports; 6900w power-user models Evidence reviewed: 2026-09-29 | Unknown |
| Power over Ethernet | YesEvidenceManufacturer specification Mitel 6900 IP Phone SeriesSection: Network Flexibility section: Dual Gigabit Ethernet Ports and Power over Ethernet Evidence reviewed: 2026-09-29 | YesEvidenceManufacturer specification 425HD IP PhoneSection: 400HD IP Phone Series Highlights > PoE or external supply Evidence reviewed: 2026-09-29 |
| Wi-FiDifference | Built inEvidenceManufacturer specification Mitel 6900 IP Phone SeriesSection: Product Variants and Features Comparison table, 6920w column, Built-in Wi-Fi row Evidence reviewed: 2026-09-29 | Unknown |
| Wi-Fi standardDifference | Unknown | Unknown |
| BluetoothDifference | Built inEvidenceManufacturer specification Mitel 6900 IP Phone SeriesSection: Product Variants and Features Comparison table, 6920w column, Bluetooth row Evidence reviewed: 2026-09-29 | Unknown |
| Bluetooth versionDifference | Unknown | Unknown |
| USB portsDifferenceRequired: ≥ 1 | Needs verificationUnknown | Needs verificationUnknown |
| Accessories | ||
| Headset interfacesDifference | Unknown | USBEvidenceManufacturer specification 425HD IP PhoneSection: 425HD Wired Connectivity > USB headset support Evidence reviewed: 2026-09-29 |
| Expansion modulesDifference | Unknown | Unknown |
| Physical | ||
| Wall mountableDifference | Unknown | Unknown |
| Audio | ||
| HD voiceDifference | Unknown | YesEvidenceManufacturer specification 425HD IP PhoneSection: 425HD Amazing Sound > HD voice quality Evidence reviewed: 2026-09-29 |
| Full-duplex speakerphone | YesEvidenceManufacturer specification Mitel 6900 IP Phone SeriesSection: Audio Quality and Interface Design section: full-duplex speakerphones Evidence reviewed: 2026-09-29 | YesEvidenceManufacturer specification 425HD IP PhoneSection: 400HD IP Phone Series Highlights > full duplex 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.
42 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.