Linksys SPA942 - complex devices, easy to set up if you know what you are doing, manual hard to get hold of (it was only given out to Disti's). We get reports of them being too quiet from some users so they may not be the best in a noisy office. Sail provisions them happily enough and we have some here. Good build quality at the price point and you get a Cisco logo on the box.
AAstra 9112i - tempramental little units. Sometimes they just won't work no matter what you do with them. Our highest rejection rate phone but also our cheapest and the audio circuits are among the best on the planet. Seriously LOUD speakerphone unit.
AAstra 51i - Great Audio, limited function from this POE only unit(you have to pay extra for a power supply if you require one). Nicer looking than the 9112i, which it replaces. much the same to set up as the 9112i but a little more stable. Fully compatible with SAIL.
Grandstream GXP2000/2020 - Easy to set-up manually. SAIL provisioning is now a little out-of-date for these phones but still works OK. Our least favourite phone here. Nasty to look at with nasty build quality. Power supply pick-up at the rear tends to break off in day-to-day use. Horrid acoustics but reasonable functionalty for the price. Made for the domestic market and best left there in our view.
Cisco 7940G - absolute bitch to set up. You have to convert them from skinny to SIP and it isn't straightforward. These phones have no browser so the ONLY way you can set them up is through SAIL provisioning, or manually, using the phone keypad. Once in use they tend to be rock solid and you grow to like them over time. Functionally they are nowhere near as good the likes of Snom or Polycom but still a good phone nonetheless.
In our view you've missed the two best...
Polycom (which we used to hate, but now like - I have a 330 on my desk) and the undisputed champ - the Snom360. Quirky, awkward to use at times and very, very German, they nevertheless are the absolute pinnacle of SIP technology right now.
Best
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