Reddit mentions of Grandstream GS-GXP2135 Enterprise IP Phone with Gigabit Speed & Supports up to 8 Lines VoIP Phone & Device

> They just don't seem to scale well to 300+ devices (pricing wise).

They scale horribly. For 300 users you should be looking at an on-premises PBX and using a voip trunk service.

I'm at 100 phones, so 1/3rd your load, and just went with a FOSS solution: freepbx on a commodity server, which is just a fancy web wrapper around asterisk. I went with Yealink phones because they're cheap and look nice enough to impress management. My project cost was very low for his kind of thing. I understand the DIY approach isn't for everyone but VOIP phones are simple to do if you have sysadmin experience.

>and the handsets we have are about 10 years old - but they all still work. I think we've had maybe 2-3 fail in that time.

10 years is really the EOL for phones. Its a bad practice to keep them longer. Soon your mortality rate with skyrocket and you'll have a hard time finding replacements. Or they will have a serious security vulnerability and the vendor won't provide a patch. Also from a politics perspective you don't want to be the guy associated with decade(s) old phones because, "Alan said they're good enough." Part of your job is to dazzle management a little now and again because that's how management works. They talk up ROI but ultimately go with their guts. A phone with a color screen is an executive toy they crave.

Handsets are relatively cheap nowadays. A basic voip phone is about $40:

https://www.amazon.com/Grandstream-GXP1620-Medium-Business-Device/dp/B00VUU8EZM/ref=pd_lpo_vtph_229_lp_t_4?_encoding=UTF8&psc=1&refRID=TB9CWR78Z55WBJJN5GE4

A more featured phone $100:

https://www.amazon.com/Grandstream-GS-GXP2170-VoIP-Phone-Device/dp/B019X06IFS/ref=pd_lpo_vtph_229_bs_t_2?_encoding=UTF8&psc=1&refRID=QDJ86RDFCDNEBR3ZQARA

Or $70 for a middle ground phone:

https://www.amazon.com/Grandstream-Enterprise-Telephone-GXP2130-Included/dp/B00JBVVZV2/ref=pd_lpo_vtph_229_bs_t_2?_encoding=UTF8&psc=1&refRID=TB9CWR78Z55WBJJN5GE4

https://www.amazon.com/dp/B01BUIWA08/ref=psdc_1086954_t3_B019X06IFS

I'm too lazy to find the Yealink equivalents, but they tend to be higher quality than Grandstream at nearly the same price.


Note, resellers like voipsupply will quote you volume prices and beat this pricing.

So anywhere between $15,000 to $25,000 for you to replace all 300 phones.

>Is there some other big name I should be considering?

Probably Shoretel if you dont want to try something like Freepbx or 3CX (which I only hear good things about). You can also buy support for these products if you choose to go this route.