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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 GRP2615 15 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-09 | AudioCodes 425HD 7 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 |
|---|---|---|
| Calling | ||
| SIP accounts / linesDifference | 16EvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; SIP accounts / line support Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Programmable keysDifference | Unknown | 8EvidenceManufacturer specification 425HD IP PhoneSection: 425HD overview > 8 programmable multi-function keys Evidence reviewed: 2026-09-29 |
| Local conference participantsDifference | 3EvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; local conference Review note: Capacity from the telephony-features row of this datasheet; verify the installed firmware before deployment. Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Display | ||
| Display sizeDifference | 4.3 inEvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; Display / LCD Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | 3.5 inEvidenceManufacturer specification 425HD IP PhoneSection: 425HD overview > 3.5-inch colour display Evidence reviewed: 2026-09-29 |
| Display resolutionDifference | 480 × 272EvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; Display / LCD Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Colour display | YesEvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; Display / LCD Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | YesEvidenceManufacturer specification 425HD IP PhoneSection: 425HD overview > colour display Evidence reviewed: 2026-09-29 |
| TouchscreenDifference | Unknown | Unknown |
| Connectivity | ||
| EthernetDifference | GigabitEvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; Network interfaces Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Power over Ethernet | YesEvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; Power supply / Power over Ethernet Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | YesEvidenceManufacturer specification 425HD IP PhoneSection: 400HD IP Phone Series Highlights > PoE or external supply Evidence reviewed: 2026-09-29 |
| Wi-FiDifference | Built inEvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; Wi-Fi / wireless connectivity Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Wi-Fi standardDifference | 802.11a/b/g/n/ac/axEvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; Wi-Fi / wireless connectivity Review note: Wi-Fi 6 applies to hardware version 5.0 and above. Verify the device revision; earlier hardware differs. Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| BluetoothDifference | Built inEvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; Bluetooth / accessories Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| Bluetooth versionDifference | Unknown | Unknown |
| USB portsDifference | Unknown | Unknown |
| Accessories | ||
| Headset interfacesDifference | EHS, RJ9EvidenceManufacturer specification Grandstream GRP2615 datasheetSection: PDF page 2: Auxiliary Ports RJ9 headset jack (allowing EHS with Plantronics headsets), USB Review note: Port and EHS mode only; exact headset, cable, and call controls require separate compatibility evidence. Evidence reviewed: 2026-09-12 | USBEvidenceManufacturer specification 425HD IP PhoneSection: 425HD Wired Connectivity > USB headset support Evidence reviewed: 2026-09-29 |
| Expansion modulesDifference | Unknown | Unknown |
| Physical | ||
| Wall mountableDifference | YesEvidenceManufacturer specification Grandstream GRP2615 datasheetSection: PDF page 2: Base Stand Yes, 2 angle positions available, Wall Mountable (*wall mount sold separately) Review note: Wall mounting may require a separately available wall mount kit; check this model's datasheet. Evidence reviewed: 2026-09-12 | Unknown |
| Audio | ||
| HD voice | YesEvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; Audio features Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | YesEvidenceManufacturer specification 425HD IP PhoneSection: 425HD Amazing Sound > HD voice quality Evidence reviewed: 2026-09-29 |
| Full-duplex speakerphoneDifference | Unknown | 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 | YesEvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; Security / encryption Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, as documented in the reviewed source. Regional availability, provider certification and exact headset combinations are unverified. | Unknown |
| SRTP media encryptionDifference | YesEvidenceManufacturer specification Grandstream GRP2615 datasheetSection: Technical specifications; Security / encryption Evidence reviewed: 2026-09-09 Applies to: Grandstream GRP2615, 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.