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Grandstream GXP2120 6-Line Executive HD IP Phone, VoIP Phone and Device
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- Generous 320x160 pixel backlit graphical LCD display with up to 8 level grayscale
- 7 programmable hard keys and 4 XML programmable context-sensitive soft keys
- 6 lines indicators with individual SIP account profiles
- Multi-line support of up to 13 call appearance lines with dual-color LED indicators
- Support SIP (RFC3261), TCP/IP/UDP, RTP, HTTP, ARP, ICMP, DNS (A record and SRV), DHCP(both client and server), PPPoE, TFTP, NTP
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The GXP2120 Executive HD telephone features 6 lines, a generous 320x160 backlit graphical LCD, 4 XML programmable context sensitive soft keys, 7 XML programmable BLF extension keys, dual network ports with integrated PoE, and 5 way conferencing. Delivering superior HD audio quality, rich telephony features, personalized information and customizable application services, the GXP2120 is the perfect choice for enterprise users looking for a high quality, feature rich multi line executive IP phone with advanced functionalities and performance. The GXP2120 also supports automated provisioning for easy deployment, advanced security protection for privacy, and broad interoperability with most 3rd party SIP devices and leading SIP/NGN/IMS platforms.
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Several reviewers here have mentioned that their VoIP provider will not provision their phone for them since it's not a model they elect to support, or they have to pay to have it provisioned. This is like saying I bought a Chevy and now I'm wondering why the Toyota Dealer I took it to is charging me a ton of money to support it. If you aren't going to provision this phone yourself, don't complain that it's the phone's fault when your service provider has preferences.
As for the phone, I like that I get a full size back-lit screen. At night, with the backlight set to it's lowest setting, the phone is a simple white nightlight that just throws enough light off to see in the room, but not enough to keep us awake.
The real power of this phone is in the provisioning - if you have to wait for a provider to provision your phone, you are really doing yourself a disservice (it isn't hard).
With 6-lines and Busy Lamps, I can tell if someone is on one of our lines anywhere in the residence. One neat thing I found out that wasn't obvious in the documentation was the message indicator - yes there is a light that shows in general that one of the lines has a message, but there is also a marker next to the line name on the screen that shows WHICH line has a message. For home use, we provisioned each "line" to a specific user - my wife has her own line, I have my own, and we have set up a "virtual line" (you can't call it directly) for the general voicemail box if you didn't know who to leave a message for. This way we can tell at a glance who has a message.
With the XML applications, we can send commands to the Asterisk PBX while we are in calls to do various things. If a telemarketer got through, we have added a hot-key to do the following through the PBX: 1) add the incoming phone number to the telemarketer blocked list, 2) end our connection to the caller, and 3) play back a pre-recorded message to the incoming caller about how we have added our number to the Do-Not-Call list and asking them to stop calling us. We can also control recording of the call from hot-keys.
The sound quality is great, in my opinion it's better than what we had with an analog line - and better than other VoIP phone we had tried before we found these. The speaker-phone is nearly the quality I experience with a Polycom - not quite as good, but for the price, well Polycom has little business in a home.
The screen is easy to read, and there are nice widgets that come with the phone: weather, stock market tracking, etc. We aren't an office at home so we don't track stocks, but I can only tell you how convenient it is to glance at the phone while I'm getting up, changing, sitting at my computer desk, or working in the kitchen - to get today's forecast, and tomorrow's. Accuracy of the weather data is pretty good, sometimes it's conservative forecasting rain when it's just overcast - but it's good enough at a high level to direct me to seek more accurate weather information if I'm concerned about weather affecting my day's plans. The weather widget is the selected home screen on all of our phones.
The weight of the handset is good, it doesn't make you feel tired while holding it for extended conversations (I've had three hour teleconferences over it and been fine). Also the options for desktop and wall mount are great - there are two heights you can prop it on your desk (both size legs are included in the box), and the wall mount works great in our kitchen.
I run all of my phones from a central PoE switch which is powered by the same UPS as the Asterisk server and cable modem - this way I don't need the included 5V adapter to be plugged in near where the phone is located. The farthest phone is powered over a 175-foot Ethernet cable
I should also mention, Grandstream had several firmware updates, these updates have improved functionality and stability of the phone. Some of the fixes were to issues I found and reported to Grandstream directly - so on the topic of support from Grandstream I can only say they listen and respond constructively (again, this is not your VoIP provider).
I also use the extension module (GXP2020-EXT) with one phone for home automation purposes - you can speed dial a number and have the PBX trigger an automation function. This works on the built-in speed dial buttons too - but I ran out of buttons.
All-in-all, I'm very happy with the phone, I highly recommend it to anyone who is able to work with a VoIP provider, or any customer/company that provisions their own phones against their own SIP PBX.
Grandstream phones are about the lowest cost IP phones available.
They will work as a basic voip phone, for dialing and receiving calls.
That is about all I can say that is positive about them.
If you want to use ALL the latest VoIP and PBX features, Grandstream will leave you wanting.
The firmware is buggy and features often don't work correctly. And Grandstream support is non-existant.
Our voip provider voiSip.com (highly recommended) suggested the brand Yealink instead.
Roughly the same price, but wow, what a difference. Everything works perfectly now.