GrandstreamDP720 Dect Cordless VoIP Telephone,Black

I wish there was more to say. It has all the features I wanted. Setting up a global directory for all phones on the base unit to use is more work than it should be, but if you're comfortable downloading and uploading files from a web browser and using Notepad to edit files, it shouldn't be a struggle for you.Range and quality is great - base station is 2 floors away from some phones with no drop in quality.

This is an IP phone which means no static, wrong volume, or random touch tone noises like you get with a regular cordless phone paired with an ATA. Other advantages of IP phones include immediate display of caller ID instead of between the first and second rings, instant call initiation after dialing, a voicemail blinking light, multiple call handling, multiple account registration, and support for wideband voice quality.Other people reverted to their terrible sounding cellphones when given only desk phones, so it had to be cordless. Cordless also means it's easier to deploy where Cat6 wiring needed for desk phones is not present. The base station can be powered with either 802.3af or AC adapter. Very useful if you want to leverage an existing UPS backed PoE infrastructure to ride out blackouts or want to ceiling mount it for better coverage. Handsets charge off cradles or you can use the micro USB port on their bottoms.Opus codec is supported which is more bandwidth efficient and tolerant of packet loss than G.722 (like all CAT-iq phones it transmits G.722 over the air, so some quality loss results from transcoding G.722 to Opus and vice versa). Speakerphone function is full duplex to allow natural conversation flow. Finally it uses standard LSD NiMH AAA batteries instead of a custom NiMH pack or lithium polymer battery. No more throwing away a phone because the battery pack wore out and replacement parts approach the cost of a whole new unit!Pairing the handset to the base was straightforward, as was typing in my VoIP account credentials. Voice quality is great. Not better than a Polycom but this is half the cost of their DECT solution. You need to correct the firmware update server URL, otherwise clicking the check firmware update button is useless. There appears to be a day light savings time bug if you enable DHCP option 2 support instead of manually selecting a time zone. Otherwise I have no complaints.

Nice cordless phones. Good feature set. Easy to pair. I'm using two on a DP750 base. Overall, there is some voice delay. Not entirely the phone's fault, but you should be aware. (VOIP SIP trunks, internal network, DECT radio to base station -- there's a lot of translating going on). Voice quality is good. Screen is good (but small). It's nice that you can charge these with wall wart or with USB cable.I'm sure you are aware the this is for VOIP and that means some configuration if you are doing it yourself. This is not like plugging in an analog DECT wireless phone.

Our phones arrived and we followed the manual instructions for set up. Phones didn’t pair/sync, didn’t make calls out or receive them in. We called the number on the manual and left a message for the help desk. No call back. A couple days later I had to register an account with their company to access the help desk and submit a ticket online. I submitted two tickets for them to just call us to troubleshoot over the phone with us and they will not do it. They ask a list of 40 questions that we are not technically savvy to provide the correct answer to; or provided the same manual we already had in PDF format. We were advised to get these phones for VoIP service. I am not sure how to even rate the product because we cannot get the help desk to simply call us back to help with initial set up.I would not recommend purchasing products from Grandstream, because it’s inevitable you’ll need the help desk at some point and it’s a total waste of time and headache.

I am very pleased with this phone and its matching base station. I use it with the excellent voip.ms phone service. I did have to upgrade the base station and phone software to the latest firmware to get a dial tone issue resolved. It takes some technical knowledge to set up (firmware update requires a simple TFTP server setup on a PC). I also had to remember "hunt group" principles (which they refer to as "HS Mode") to get multiple handsets to simultaneously ring.Battery life is excellent so far. Only change I would make is to add a lighted keypad.