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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 GXP1615 11 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-11 | AudioCodes 445HD 9 of 23 specifications recorded Lifecycle: Unknown Record reviewed: 2026-09-29 |
|---|---|---|
| Calling | ||
| SIP accounts / linesDifference | 2EvidenceManufacturer specification Grandstream GXP1615 datasheetSection: Page 2 — Feature Keys: SIP accounts Review note: The currently linked May 2023 datasheet specifies two SIP accounts; older documentation or revisions may differ. Evidence reviewed: 2026-09-11 Applies to: Grandstream GXP1615; currently linked manufacturer datasheet. | Unknown |
| Programmable keysDifference | Unknown | 6EvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > 6 programmable multi-function keys; excludes 12 sidecar speed-dial keys Evidence reviewed: 2026-09-29 |
| Local conference participantsDifference | 3EvidenceManufacturer specification Grandstream GXP1615 datasheetSection: Page 2 — Telephony Features Evidence reviewed: 2026-09-11 Applies to: Grandstream GXP1615; currently linked manufacturer datasheet. | Unknown |
| Display | ||
| Display sizeDifference | 2.95 inEvidenceManufacturer specification Grandstream GXP1615 datasheetSection: Page 2 — Graphic Display Evidence reviewed: 2026-09-11 Applies to: Grandstream GXP1615; currently linked manufacturer datasheet. | 4.3 inEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > Graphic 4.3-inch colour LCD screen Evidence reviewed: 2026-09-29 |
| Display resolutionDifference | 132 x 48EvidenceManufacturer specification Grandstream GXP1615 datasheetSection: Page 2 — Graphic Display Evidence reviewed: 2026-09-11 Applies to: Grandstream GXP1615; currently linked manufacturer datasheet. | 480 x 272EvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > Graphic 4.3-inch colour LCD screen (480x272) Evidence reviewed: 2026-09-29 |
| Colour displayDifference | Unknown | YesEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > Graphic colour LCD screen Evidence reviewed: 2026-09-29 |
| TouchscreenDifference | Unknown | Unknown |
| Connectivity | ||
| EthernetDifference | 10/100EvidenceManufacturer specification Grandstream GXP1615 datasheetSection: Page 2 — Network Interfaces Evidence reviewed: 2026-09-11 Applies to: Grandstream GXP1615; currently linked manufacturer datasheet. | GigabitEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > GbE Support Evidence reviewed: 2026-09-29 |
| Power over EthernetDifference | YesEvidenceManufacturer specification Grandstream GXP1615 datasheetSection: Page 2 — Network Interfaces / Power Review note: The shared datasheet distinguishes the powered variants: GXP1610P/GXP1615 and GXP1625 include PoE; GXP1610 and GXP1620 do not. Evidence reviewed: 2026-09-11 Applies to: Grandstream GXP1615; currently linked manufacturer datasheet. | YesEvidenceManufacturer specification 445HD IP PhoneSection: IP Phone Series Highlights > PoE or external power 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 | RJ9EvidenceManufacturer specification Grandstream GXP1615 datasheetSection: Page 2 — Headset Jack / Auxiliary Ports Evidence reviewed: 2026-09-11 Applies to: Grandstream GXP1615; currently linked manufacturer datasheet. | USBEvidenceManufacturer specification 445HD IP PhoneSection: 445HD Features > USB headset support; other connector paths not assumed Evidence reviewed: 2026-09-29 |
| Expansion modulesDifference | Unknown | Unknown |
| Physical | ||
| Wall mountableDifference | YesEvidenceManufacturer specification Grandstream GXP1615 datasheetSection: Page 2 — Base Stand / Wall Mountable Evidence reviewed: 2026-09-11 Applies to: Grandstream GXP1615; currently linked manufacturer datasheet. | Unknown |
| Audio | ||
| HD voice | YesEvidenceManufacturer specification Grandstream GXP1615 datasheetSection: Page 1 — HD audio / Page 2 — Voice Codecs Evidence reviewed: 2026-09-11 Applies to: Grandstream GXP1615; currently linked manufacturer datasheet. | YesEvidenceManufacturer specification 445HD IP PhoneSection: 445HD hero features > HD voice with SILK vocoder Evidence reviewed: 2026-09-29 |
| Full-duplex speakerphoneDifference | Unknown | YesEvidenceManufacturer specification 445HD IP PhoneSection: IP Phone Series Highlights > Full duplex speaker phone Evidence reviewed: 2026-09-29 |
| Audio codecsDifference | Unknown | Unknown |
| Software | ||
| Operating systemDifference | Unknown | Unknown |
| Security | ||
| TLS signallingDifference | YesEvidenceManufacturer specification Grandstream GXP1615 datasheetSection: Page 2 — Security Evidence reviewed: 2026-09-11 Applies to: Grandstream GXP1615; currently linked manufacturer datasheet. | Unknown |
| SRTP media encryptionDifference | YesEvidenceManufacturer specification Grandstream GXP1615 datasheetSection: Page 2 — Security Evidence reviewed: 2026-09-11 Applies to: Grandstream GXP1615; currently linked manufacturer datasheet. | 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.
Needs verification Not on reviewed list
Evidence reviewed: 2026-09-11
Sources and scope
Grandstream GXP1615. Current provider lists only. Not listed does not establish technical incompatibility. Historical 3CX V18 firmware and configuration material is not treated as current V20 support. Regional availability, hardware revisions and accessories remain unverified. No tenant or device was tested.
- 3CX V20 phone firmware
V20 scope statement and complete Phone Firmware table; no Grandstream or GXP row
Not reviewed
Zoom Phone
Yealink phones require Zoom-specific firmware. A certification entry does not confirm every feature or regional deployment.
Needs verification Not on reviewed list
Evidence reviewed: 2026-09-11
Sources and scope
Grandstream GXP1615. Current provider lists only. Not listed does not establish technical incompatibility. Historical 3CX V18 firmware and configuration material is not treated as current V20 support. Regional availability, hardware revisions and accessories remain unverified. No tenant or device was tested.
- Zoom Phone certified hardware
Desk phones > Grandstream exact-model table; the GXP model is absent; the page directs owners of unlisted models to Grandstream if assisted provisioning fails
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.
Needs verification Not on reviewed list
Evidence reviewed: 2026-09-11
Sources and scope
Grandstream GXP1615. Current provider lists only. Not listed does not establish technical incompatibility. Historical 3CX V18 firmware and configuration material is not treated as current V20 support. Regional availability, hardware revisions and accessories remain unverified. No tenant or device was tested.
- Microsoft Teams SIP Gateway plan
Compatible devices table; no Grandstream vendor or GXP model row
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.