Grandstream DP735 Ruggedized High-Tier DECT Handset
AIM Telecom provides troubleshooting and configuration support for this product to businesses across Canada and the USA. Contact us to confirm whether the issue can be handled by phone or requires on-site service.
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Common issues and fixes
Reviewed troubleshooting steps are not yet available for this model.
Ask AIM Telecom about this productAbout this product
The DP735 is a ruggedized DECT cordless IP phone designed for businesses and residential environments. Key features include:
• Up to 20 SIP accounts per system
• DECT authentication & encryption technology for secure calls
• 3-way audio conferencing for easy conference calls
• Dedicated Push-to-Talk button with built-in proximity and accelerometer sensors
• Automated provisioning options, including TR-069 and XML config files
• Compatible with Grandstream’s UCM series of IP PBXs for Zero Config provisioning
• HD audio to maximize audio quality and clarity
• Ruggedized design with IP67 Rated-Waterproof, dust-proof, cleaning chemical resistant, anti-microbial casing, and drop safe from 2.5m
Package Contents:
Handset Unit
Universal Power Supply
Charger Cradle
Belt Clip
1 Battery
Quick Start Guide
Air Interface:
Telephony standards: DECT
Frequency bands: 1880 – 1900 MHz (Europe), 1920 – 1930 MHz (US)
Number of Channels: up to 10 (Europe), up to 5 (US, Brazil or Japan)
Outdoor Range: up to 400 meters (DP752/DP755) or up to 300 meters (DP750)
Indoor Range: up to 50 meters
Protocol/Standards: HAC compliant
Voice Codecs: G.722 codec for HD audio and G.726 codec for narrow band audio (G.711μ/a-law, G.723.1, G.729A/B, iLBC and OPUS)
Telephony Features:
Hold, transfer, forward, 3-way conference, push-to-talk, intercom, downloadable phonebook, call waiting, call log, auto answer, click-to-dial, flexible dial plan
HD Audio: Yes, both on Handset and Speakerphone
Security: DECT authentication & encryption
Upgrade/Provisioning:
Software Upgrade Over-The-Air (SUOTA), handset provisioning Over-The-Air
Multi-line Access:
Each handset may access up to twenty (20) lines
Dimensions (H x W x D):
Handset: 166.00 x 57.80 x 26.30mm
Charger cradle: 82.00 x 80.00 x 30.60mm
• Up to 20 SIP accounts per system
• DECT authentication & encryption technology for secure calls
• 3-way audio conferencing for easy conference calls
• Dedicated Push-to-Talk button with built-in proximity and accelerometer sensors
• Automated provisioning options, including TR-069 and XML config files
• Compatible with Grandstream’s UCM series of IP PBXs for Zero Config provisioning
• HD audio to maximize audio quality and clarity
• Ruggedized design with IP67 Rated-Waterproof, dust-proof, cleaning chemical resistant, anti-microbial casing, and drop safe from 2.5m
Package Contents:
Handset Unit
Universal Power Supply
Charger Cradle
Belt Clip
1 Battery
Quick Start Guide
Air Interface:
Telephony standards: DECT
Frequency bands: 1880 – 1900 MHz (Europe), 1920 – 1930 MHz (US)
Number of Channels: up to 10 (Europe), up to 5 (US, Brazil or Japan)
Outdoor Range: up to 400 meters (DP752/DP755) or up to 300 meters (DP750)
Indoor Range: up to 50 meters
Protocol/Standards: HAC compliant
Voice Codecs: G.722 codec for HD audio and G.726 codec for narrow band audio (G.711μ/a-law, G.723.1, G.729A/B, iLBC and OPUS)
Telephony Features:
Hold, transfer, forward, 3-way conference, push-to-talk, intercom, downloadable phonebook, call waiting, call log, auto answer, click-to-dial, flexible dial plan
HD Audio: Yes, both on Handset and Speakerphone
Security: DECT authentication & encryption
Upgrade/Provisioning:
Software Upgrade Over-The-Air (SUOTA), handset provisioning Over-The-Air
Multi-line Access:
Each handset may access up to twenty (20) lines
Dimensions (H x W x D):
Handset: 166.00 x 57.80 x 26.30mm
Charger cradle: 82.00 x 80.00 x 30.60mm
More product details
The DP735 is built for workplaces where a standard desk phone would not survive the day. Warehouses, manufacturing floors, outdoor service yards, and even busy restaurant kitchens are natural fits. The ruggedized casing shrugs off drops, dust, and chemical cleaning, while the IP67 rating means a splash or a brief dunk will not end a shift. It pairs with Grandstream’s DECT base stations (DP750, DP752, DP755) and integrates cleanly into a UCM-based IP PBX, making it a practical extension for a company that already runs Grandstream voice infrastructure.
Because it is a DECT handset, not a Wi-Fi device, it relies on a base station for connectivity. This gives it excellent voice quality and handoff within the base’s coverage area, but it also means you cannot simply connect it to a corporate Wi-Fi network and go. The quoted indoor range of up to 50 metres is typical for DECT, though steel shelving and thick concrete will reduce that considerably. In a large facility, careful placement of multiple base stations is essential to avoid dead zones.
For a Toronto-area business, the handset’s resistance to road salt, slush, and wide temperature swings is a genuine advantage if the phone moves between a heated office and a loading bay. The sealed design also holds up well against the fine dust common in older industrial buildings around the GTA. It is not, however, a replacement for an intrinsically safe device in hazardous locations; the IP rating covers water and dust, not explosive atmospheres.
This handset is overkill for a carpeted office where a standard cordless phone would do. It is also not the right choice for a user who needs a large colour screen, video calling, or a smartphone-like app experience. Where it excels is in giving a worker a reliable, loud, and near-indestructible voice endpoint that simply works after a hard knock.
Because it is a DECT handset, not a Wi-Fi device, it relies on a base station for connectivity. This gives it excellent voice quality and handoff within the base’s coverage area, but it also means you cannot simply connect it to a corporate Wi-Fi network and go. The quoted indoor range of up to 50 metres is typical for DECT, though steel shelving and thick concrete will reduce that considerably. In a large facility, careful placement of multiple base stations is essential to avoid dead zones.
For a Toronto-area business, the handset’s resistance to road salt, slush, and wide temperature swings is a genuine advantage if the phone moves between a heated office and a loading bay. The sealed design also holds up well against the fine dust common in older industrial buildings around the GTA. It is not, however, a replacement for an intrinsically safe device in hazardous locations; the IP rating covers water and dust, not explosive atmospheres.
This handset is overkill for a carpeted office where a standard cordless phone would do. It is also not the right choice for a user who needs a large colour screen, video calling, or a smartphone-like app experience. Where it excels is in giving a worker a reliable, loud, and near-indestructible voice endpoint that simply works after a hard knock.