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 C450HD 9 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 Selected requirements: 0 met · 0 not met · 2 unknown | HP Poly Edge E550 9 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 Selected requirements: 2 met · 0 not met · 0 unknown |
|---|---|---|
| Calling | ||
| SIP accounts / linesDifference | Unknown | Unknown |
| Programmable keysDifference | 8EvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > up to 8 programmable on-screen keys Evidence reviewed: 2026-09-29 | 12EvidenceManufacturer specification Poly Edge E550 IP PhoneSection: 82M91AA > All the features you could ask for > 12-line keys Evidence reviewed: 2026-09-29 |
| Local conference participantsDifference | Unknown | Unknown |
| Display | ||
| Display size | 5 inEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > 5-inch colour TFT screen Evidence reviewed: 2026-09-29 | 5 inEvidenceManufacturer specification Poly Edge E550 IP PhoneSection: 82M91AA > All the features you could ask for > large 5-inch colour display Evidence reviewed: 2026-09-29 |
| Display resolutionDifference | 1280 x 720EvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > 1280 x 720 screen Evidence reviewed: 2026-09-29 | Unknown |
| Colour display | YesEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > colour TFT screen Evidence reviewed: 2026-09-29 | YesEvidenceManufacturer specification Poly Edge E550 IP PhoneSection: 82M91AA > All the features you could ask for > colour display Evidence reviewed: 2026-09-29 |
| TouchscreenDifference | YesEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > touch screen interface Evidence reviewed: 2026-09-29 | Unknown |
| Connectivity | ||
| Ethernet | GigabitEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > GbE support Evidence reviewed: 2026-09-29 | GigabitEvidenceManufacturer specification Poly Edge E550 IP PhoneSection: 82M91AA > Versatile connectivity > two high-speed GigE ports Evidence reviewed: 2026-09-29 |
| Power over Ethernet | YesEvidenceManufacturer specification C450HD IP PhoneSection: IP Phone Series Highlights > PoE or external supply Evidence reviewed: 2026-09-29 | YesEvidenceManufacturer specification Poly Edge E550 IP PhoneSection: 82M91AA > Versatile connectivity > GigE PoE Ethernet ports Evidence reviewed: 2026-09-29 |
| Wi-FiDifferenceRequired: Built in | Needs verificationUnknown | Meets requirementBuilt inEvidenceManufacturer specification Poly Edge E550 IP PhoneSection: 82M91AA > Works wherever you do > 802.11AC Wi-Fi included Evidence reviewed: 2026-09-29 |
| Wi-Fi standardDifference | Unknown | Unknown |
| BluetoothDifferenceRequired: Built in | Needs verificationUnknown | Meets requirementBuilt inEvidenceManufacturer specification Poly Edge E550 IP PhoneSection: 82M91AA > Perfectly paired > integrated Bluetooth 5.0 Evidence reviewed: 2026-09-29 |
| Bluetooth versionDifference | Unknown | 5.0EvidenceManufacturer specification Poly Edge E550 IP PhoneSection: 82M91AA > Perfectly paired > integrated Bluetooth 5.0 Evidence reviewed: 2026-09-29 |
| USB portsDifference | Unknown | Unknown |
| Accessories | ||
| Headset interfacesDifference | USBEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > USB headset support Evidence reviewed: 2026-09-29 | Bluetooth, USB, RJ9, EHSEvidenceManufacturer specification Poly Edge E550 IP PhoneSection: 82M91AA > Versatile connectivity > Bluetooth, USB, RJ9 and EHS Evidence reviewed: 2026-09-29 |
| Expansion modulesDifference | Unknown | Unknown |
| Physical | ||
| Wall mountableDifference | Unknown | Unknown |
| Audio | ||
| HD voiceDifference | Unknown | Unknown |
| Full-duplex speakerphoneDifference | YesEvidenceManufacturer specification C450HD IP PhoneSection: IP Phone Series Highlights > full duplex speakerphone Evidence reviewed: 2026-09-29 | Unknown |
| 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.
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.