Documented specifications
Grandstream · Manufacturer documentation available at review; remaining support period and local availability not established.
| Specification | Documented value |
|---|---|
| SIP accounts | 2 Source ↗ |
| Display | 1.77-inch color Source ↗ |
| Wi-Fi | Dual-band Wi-Fi 6; 802.11k/r/v supported Source ↗ |
| Bluetooth | Integrated Source ↗ |
| Battery | 1500 mAh Source ↗ |
| Talk time | 6 hours, manufacturer rating Source ↗ |
| Standby time | 120 hours, manufacturer rating Source ↗ |
| Charging | USB-C Source ↗ |
| Provisioning | GDMS, TR-069 or configuration file Source ↗ |
Unlisted fields remain unverified. Platform compatibility and remaining support life require confirmation for the exact ordered model.
Keep the exact handset and capacity in view
WP816 is a handheld SIP phone for staff who move within a managed Wi-Fi network. Grandstream documents two SIP accounts and two lines, a 1.77-inch display, integrated Bluetooth 5.0, a 3.5 mm headset jack and USB-C charging. Accounts and lines are configuration capacities, not proof of two simultaneous conversations or a particular PBX feature set. Do not copy the larger battery, display or account count of WP826 or WP836 onto this model.
The current datasheet also lists five-way audio conferencing, Opus and other codecs. Those are endpoint capabilities; actual registration, codec negotiation, conference ownership and usable media depend on the configured service and call path.
Treat Wi-Fi roaming as a shared system
Grandstream documents dual-band Wi-Fi 6 and support for 802.11k, 802.11r and 802.11v. That does not establish that every access point, controller, SSID or authentication design enables the same roaming workflow. Record the handset firmware, radio band, SSID, security method, AP/controller versions and enabled roaming features before testing.
Walk the real route during an authorized call, including stairs, storerooms and AP boundaries. Correlate roam time, packet loss, jitter, retransmissions and audible interruption rather than treating continued association as voice acceptance. Use DECT or a different rugged device category when a separate cordless voice system or weatherproof enclosure better fits the site; Grandstream's comparison marks WP816 as not weatherproof.
Separate rated endurance from shift acceptance
The product page and datasheet state a 1500 mAh battery, six hours of talk time and 120 hours of standby. The datasheet identifies those time figures as laboratory data. They do not establish endurance for a production shift with a particular RSSI, roaming frequency, screen use, Bluetooth headset, push-to-talk pattern, codec or battery age.
Measure an agreed work pattern from a known charge state, include idle and roaming periods, and record firmware, battery identity, accessories and radio conditions. Verify USB-C charging, cradle placement, headset controls and missed-call behavior after idle periods. A single long call is not a substitute for shift-cycle acceptance.
Bound push-to-talk and the emergency button
Grandstream lists a configurable push-to-talk button, accelerometer and emergency button. Those labels do not establish emergency calling, location delivery, alarm routing, monitoring, dispatch response or legal compliance. Document the configured button action, application or server dependency, authorized recipient, acknowledgement path, behavior while locked or offline and recovery after a failed attempt. Keep an independently available emergency-calling path.
For Bluetooth and wired headsets, test answer, end, mute, volume, reconnection and audio routing with the exact accessory and firmware. A headset being discoverable or physically connected does not prove call-control interoperability.
Control firmware and provisioning as fleet changes
On October 5, 2026, Grandstream's firmware table listed 1.0.3.35 as general firmware for WP816, WP826 and WP836 and 1.0.3.39 as beta. The user guide changelog also names 1.0.3.35. Recheck the live table and release notes at change time; this record does not recommend the beta build or make the listed versions permanent.
The datasheet lists GDMS, TR-069 and configuration-file provisioning, while the user guide documents several firmware and configuration transports. Record which system owns the device, the exact artifact and server, certificate validation, administrator roles and rollback path. Preserve the prior configuration and use a bounded pilot before fleet rollout; successful download, reboot, registration and call completion remain separate results.
Evidence and purchase boundaries
This guide uses current manufacturer product, datasheet, user-guide and firmware-table evidence. No handset, battery, radio, access point, PBX, account, headset, button workflow, provisioning service, protected session, registration, call or media path was inspected or tested.
Current price, merchant stock, regional availability, PBX certification, accessory compatibility and remaining support period remain unverified. Confirm all of them for the exact region, supplier, hardware and installed firmware before a fleet purchase.
Sources & applicability
Primary references for the technical details above. Operational examples and planning checklists are VoIP.info editorial guidance.
- Grandstream WP816 manufacturer specifications ↗
- Grandstream WP816 datasheet, version 4 ↗
- Grandstream WP816, WP826 and WP836 user guide ↗
- Grandstream firmware table ↗
Examples require adaptation to your topology. No live PBX or hardware testing is claimed.