We recommend and fully support YeaLink products due to their feature set, ease of use and technology. Additional YeaLink product manuals can be found in @ https://www.simplifi.io/docs/contact
Simplifi Contact will work with most any IP based phone. The use of a ATA (Analog Telephony Adapter) will be necessary for older analog based phone systems.
We will support other phones and devices to an extent. These are limited to phone features and feature setup within the Simplifi Contact environment. These will be treated in a case by case basis, please check with your sales or solutions expert for additional information.