Great work phone
The form factor of these phones are both visually appealing and physically comfortable to work with on a daily basis. We are using them for a Ring Central account and the setup was a breeze - even for the non-technical people. I would make one technical recommendation to purchasers: these do not come with a power supply. If you are a medium sized or larger office (not just 1 or 2 people), then I would recommend purchasing a POE switch to power the phones instead of the $15 power brick.
Excellent audio, quality Intuitive to use
The Cisco SPA504G is a very good phone. With HD voice supported, it delivers excellent voice quality in an intuitive and well-made piece of hardware. The OnSIP team is thrilled to see another manufacturer taking steps to bring HD voice to midrange phones that won't cost customers an arm and a leg.
Works nicely for me
The review that gave this phone 1 star because of the PoE issue wasn't reasonable. To be clear - the phone does not come with a power adapter. You will need to buy one separately or use a PoE (Power over Ethernet) injector or switch to power the phone. I don't mind this at all - in some locations, it's easier to power it with PoE, and I appreciate not having to pay for an extra adapter I won't use.
This is not a consumer phone.
Very affordable - A lot of bang for your buck
The Grandstream GXP 2020 Enterprise SIP phone is in the company's GXP series of phones, a line that focuses on devices that are "feature rich, auto-provisionable for mass deployment, easy to use and competitively priced". The company specializes in very affordable VoIP equipment and the GXP 2020 is no exception. At around $80, this phone is probably one of the most affordable 'executive class' phones on the market.
Incredibly stable, powerful business tool
I recently oversaw the purchase and installation of Cisco CallManager and Cisco IP telephones. This was my company's first venture into IPT and we did so with both guns blazing, so to speak. Our standard setup is the Cisco IP Phone 7940 series. This phone has proven itself to be rock-solid, stable and powerful. We have experienced 100% uptime with our VoIP telephones and response from users has been terrific.
Couldn't connect to our usual, WPA-encrypted wireless network
A bit bigger and heavier than the UTStarcom F1000, the blue backlit ZyXEL P2000W V2 scores points for its normal-sounding ringtones. It's a bit thinner than the F1000, so it's a better fit for your pocket despite the added length. Unfortunately, that's pretty much it for the pluses.
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