Polycom and Huawei are the two next largest providers of telepresence equipment and there are a host of smaller competitors.
As far as phones Avaya is the big competitor in the enterprise space. Microsoft Skype for Business/Lync is also deployed many places for voice using phones from a variety of suppliers including Polycom and HP. Lately a lot of enterprises have started to move away from desk phones to using soft phones.
Cool, I'll have to look into both! Huawei feels like an "Oh, right, of course" answer but Polycom doesn't ring any bells.
Interesting observation on the soft phones trend, though. In my work environment our Cisco phones might as well be softphones since everything's rigged through Jabber. Give us a webcam instead of the desk phone and I don't see any loss of functionality.
As far as phones Avaya is the big competitor in the enterprise space. Microsoft Skype for Business/Lync is also deployed many places for voice using phones from a variety of suppliers including Polycom and HP. Lately a lot of enterprises have started to move away from desk phones to using soft phones.