This article explains how to install Asterisk Plus Odoo addons.
Install Asterisk Plus addons in Odoo
First, download the full package with Asterisk Plus addons from https://odoopbx.com/download. Unpack and copy them to Odoo's addons folder.
Install the addons as any other Odoo modules, refer to Odoo documentation for details if needed.
Install python requirements
There is a requirements.txt file in the downloaded package. Install these python dependencies using the command:
pip3 install -r requirements.txt
If you use odoo.sh make sure you have requirements.txt file in your modules top folder so that odoo.sh can install the required dependencies.
If you use python virtualenv make sure you install the requirements there and not system wide.