Polycom started the VoIP revolution
Desk phones used to be $1000 each. After Polycom created open source phone devices, they became $100. Thank your Polycom (now HP) by buying open source phones.
Sourcing a phone is very easy and should not hinder productivity. Pairing your Polycom Desk phone to a Plantronics Headset requires a special cable. The productivity and comfort outweigh the cost.