• Grandstream battery charging pack for our mobile telephony products
• 8 independent slots for Lithium-Ion batteries
• Capable of charging or discharging multiple batteries simultaneously
• Three settings for air shipment, storage capacity control, and full charge
• Over-voltage, over-charge, over-current, and short-circuit management
• Charging Battery Type Lithium-Ion battery
• LED 8 independent dual-color LEDs for charging/discharging status
• Fan 1 fan for temperature control
• Three capacity levels: Low-capacity (20%-30%) for sea/land/air transport,
• Intermediate-capacity (60%) for extended duration transportation and storage, and high-capacity (100%) charging
• Universal power adapter included: Input: 100 ~ 240V 50/60Hz; Output: 12VDC 2A (24W)

COMPATIBILITY

• DP730 DECT phone
• WP820 Wifi phone

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• Up to 2 concurrent HD calls
• Extends an additional range of 300 meters outdoors and 50 meters indoors for added mobility
• Automatic or manual association to DP750, base station for easy use
• Supports Plug-n-Play features like auto association, auto region detection and seamless call handover
• Automated provisioning options include XML config files

The Grandstream DP760 supports RF link (daisy chain) mode, or pairing with the DP750 over a network for transport. Each method has slightly different supported features. The DP760 supports one HD call in “daisy chain” mode, or two HD calls when using Ethernet-based pairing and transport. The device supports G.722, the wideband codec, or G.726, the narrow band codec. The Grandstream DP750 base station itself actually has support for several more codecs – more on this later.

Configuration

The Grandstream DP760, unlike the DP750, appears to be a multi-region device. The DECT radio standard utilizes different frequencies in Europe, Asia, and the United States. The DP760 is capable of operating on any of the required DECT spectrums, whereas the DP750 has region specific variants.

The DP760 is advertised as supporting “auto pairing”, but this is not quite true. Pairing the Grandstream DP760 to the Grandstream DP750 requires a little effort, at least in the United States. Out of the box, the DP760 appears to be set to scan for pairing requests on the European DECT standard frequencies. As a result, it will not auto pair with a US region DECT base station. Perhaps this will change with the launch device. We’ll have to wait and see.

To pair the Grandstream DP760 repeater with a DP750 base station in the United States, you must:

1. Connect the Grandstream DP760 to the same LAN as the DP750 using an Ethernet cable.

2. Enable Repeater Mode, and Repeater Management under the DECT General Settings tab on your DP750 base station.

3. Reboot the Grandstream DP750.

4. Go to the Status DECT Repeater Status page of the DP750. You may need to refresh your page, or clear your browser cache for this new option to appear. Pair the DP750 with the newly discovered DP760.

Testing

Voice and Sound Quality

Currently, the Grandstream DP750/DP760 cannot display the handsets associated with each device. However, this is apparently a planned feature. You can determine which handset is associated with the device from the handset settings menu. We made sure that the DP720 handset was associated with the repeater for all tests, and our DP760 repeater was connected to a LAN at all times, rather than using the RF link in daisy chain mode.

Voice quality was excellent for all of our test calls. It’s worth noting that the DECT interface only specifies two codecs for the RF interface, or the link between the handset and the base or repeater station. The voice codecs are G.722 for wideband, and G.726 for narrowband. It’s important to note that ALL calls from a Grandstream DP720 handset start using the G.722 wideband codec per the DECT specification. The calls are then transcoded by the base station to the codec specified in the profile.

This is one of the reasons why only a single call is supported when using RF daisy chain mode. The actual RF bandwidth utilized for the G.722 codec doesn’t allow for more calls. While this does sacrifice capacity for the sake of quality, we can say the quality is very good. Grandstream does recommend using G.722 at the SIP profile level to support the highest quality audio and avoid any transcoding.

Range

Our test of the DP720 DECT phone’s range was not in any way a scientific test. We did our best with the circumstances. The building we tested in is all brick, built circa 1881, and roughly 150 feet long and approximately 50 feet wide. The base station was at one end of the building, and the repeater was at the opposite end of the building, approximately 150 feet away. Both devices were connected to the LAN via Ethernet.

Within the building coverage, there weren’t any dead zones or areas where calls started to break up. We were able to make calls and keep conversations going for approximately 100 yards outside of either end of the building. That’s 100 yards away from either the base station, or the repeater, through a brick wall, with a total coverage area of about 250 yards in diameter. This seems reasonably in line with Grandstream’s claims of “300 meters outdoors and 50 meters indoors”.

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The DP755 is a powerful DECT VoIP phone base station that pairs with up to 10 of Grandstream’s DP series DECT handsets to offer mobility to business and residential users. It supports an outdoor range of up to 400 meters with the DP730 or up to 350 meters with DP722/DP720 as well as an indoor range of up to 50 meters to give users the freedom to move around their work or home. This DECT VoIP phone base station supports up to 10 handsets and 20 SIP accounts while also offering 3-way voice conferencing, full HD audio, and integrated PoE. A shared SIP account on all handsets will add seamless unified features that give users the ability to answer all calls regardless of location in real-time. The DP755 supports a variety of auto-provisioning methods and TLS/SRTP/HTTPS encryption security. When paired with Grandstream’s DP720, DP722, or DP730 handsets, the DP755 offers a powerful cordless DECT solution for any business or residential user.

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• Pairs with up to 5 of Grandstream’s DP series DECT handsets via instant pairing using a dedicated pairing button
• Up to 10 SIP accounts per system; up to 10 lines per handset
• Support outdoor range of up to 400 meters with the DP730 or up to 350 meters with DP722/DP720 as well as indoor range up to 50 meters
• Supports Push-to-Talk and activity based on proximity and accelerometer sensors
• Automated provisioning options include TR-069 and XML con g les

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Features

• Supports a range of up to 400 meters outdoors and 50 meters indoors when used with the DP752 (300 meters outdoors when used with DP750)
• 2.4 inch (240×320) color LCD with 3 programmable soft keys
• Offers 40-hour talk time and 500-hour standby time
• Supports up to 10 SIP accounts and 10 lines per handset as well as 3-way conferencing
• Dedicated push-to-talk button, built-in proximity and accelerometer sensors for gesture control and alert notification
• Supports video streaming display and seamless 1-touch door control with Grandstream’s GDS3700 series Door Cameras
• HD audio on the speakerphone, handset, and headset jack
• Software and firmware updates over-the-air

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• Up to 10 SIP accounts per system; up to 10 lines per handset; up to 5 concurrent calls per DECT system
• Supports a range of up to 300 meters outdoors and 50 meters indoors
• 3-way voice conferencing, full HD audio, integrated PoE
• Automated provisioning options include TR-069 and XML config files
• TLS and SRTP security encryption technology to protect calls and accounts
• Use with Grandstream’s UCM series of IP PBXs for Zero Config provisioning
• Offers multiple ring group options, including Circular, Linear, Parallel and Shared modes

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• Supported by Grandstream’s DP750 DECT Base Station
• 5 DP720 handsets are supported by each DP750
• Supports a range of 300 meters outdoors and 50 meters indoors from the DP750 base station
• Supports up to 10 SIP accounts per handset
• Full HD audio on both the speakerphone and handset
• 3.5mm headset jack, 3-way voice conferencing
• Automated provisioning options include TR-069 and XML config files
• DECT authentication & encryption technology to protect calls and account

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