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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 | Grandstream GRP2602G 10 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-09 | AudioCodes C450HD 9 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 |
|---|---|---|
| Calling | ||
| SIP accounts / linesDifference | 4EvidenceManufacturer specification Grandstream GRP2602G datasheetSection: Technical specifications; SIP accounts / line support Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2602G, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Programmable keysDifference | Unknown | 8EvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > up to 8 programmable on-screen keys Evidence reviewed: 2026-09-29 |
| Local conference participantsDifference | 5EvidenceManufacturer specification Grandstream GRP2602G datasheetSection: Technical specifications; local conference Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2602G, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Display | ||
| Display sizeDifference | 2.41 inEvidenceManufacturer specification Grandstream GRP2602G datasheetSection: Technical specifications; Display / LCD Review note: The current datasheet specifies 2.41 inches; older documentation may list a different diagonal. Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2602G, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | 5 inEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > 5-inch colour TFT screen Evidence reviewed: 2026-09-29 |
| Display resolutionDifference | 132 × 48EvidenceManufacturer specification Grandstream GRP2602G datasheetSection: Technical specifications; Display / LCD Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2602G, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | 1280 x 720EvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > 1280 x 720 screen Evidence reviewed: 2026-09-29 |
| Colour displayDifference | Unknown | 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 Grandstream GRP2602G datasheetSection: Technical specifications; Network interfaces Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2602G, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | GigabitEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > GbE support Evidence reviewed: 2026-09-29 |
| Power over Ethernet | YesEvidenceManufacturer specification Grandstream GRP2602G datasheetSection: Technical specifications; Power supply / Power over Ethernet Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2602G, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | YesEvidenceManufacturer specification C450HD IP PhoneSection: IP Phone Series Highlights > PoE or external supply 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 | Unknown | USBEvidenceManufacturer specification C450HD IP PhoneSection: C450HD Features > USB headset support Evidence reviewed: 2026-09-29 |
| Expansion modulesDifference | Unknown | Unknown |
| Physical | ||
| Wall mountableDifference | Unknown | Unknown |
| Audio | ||
| HD voiceDifference | YesEvidenceManufacturer specification Grandstream GRP2602G datasheetSection: Technical specifications; Audio features Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2602G, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Full-duplex speakerphone | YesEvidenceManufacturer specification Grandstream GRP2602G datasheetSection: Technical specifications; Audio features Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2602G, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | YesEvidenceManufacturer specification C450HD IP PhoneSection: IP Phone Series Highlights > full duplex speakerphone Evidence reviewed: 2026-09-29 |
| Audio codecsDifference | Unknown | Unknown |
| Software | ||
| Operating systemDifference | Unknown | Unknown |
| Security | ||
| TLS signallingDifference | YesEvidenceManufacturer specification Grandstream GRP2602G datasheetSection: Technical specifications; Security / encryption Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2602G, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| SRTP media encryptionDifference | YesEvidenceManufacturer specification Grandstream GRP2602G datasheetSection: Technical specifications; Security / encryption Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2602G, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations 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.
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.