Hi,

Please refer to the links:

1. https://www.odoo.com/documentation/18.0/applications/productivity/voip.html

2. https://www.odoo.com/documentation/18.0/applications/productivity/discuss/ice_servers.html

Hope it helps.

Hi there!
If you use Twilio check out Oduist Connect module that integrates Twilio Voice API with Odoo making calling from / to Odoo using native Odoo Phone widget.
See it in action - 

https://www.youtube.com/watch?v=7kcqw4XqIKQ