No, due to no response at that time.
The jami-daemon package provides the p2p backend dependency.
My search had turned up the issue “user’s “home” devices as (distributed) proxies”, and there it was said that a startup option controls if a node provides proxy services for mobile clients: “./dhtnode --proxyserver 8000 will launch a DHT node as a proxy server”.
The docs for the Jami Account Management Server (JAMS) are included in the download at https://jami.net/services/