Multiple lines per endpoint

Hello All,

This may be a stupid question, and if so I apologize. I have what appears to be a fairly well working system based on a Cisco routing solution and Trixbox CE 2.6. I am using Cisco 7940 and 7960 IP phones, currently loaded with SIP 8.12 firmware. Is there a way to assign multiple extensions or lines to these phones in trixbox? Or does it limit to only one?

I would also like to know this.

trixbox is an abandoned project. This is FreePBX support.

The Cisco phones support as many registrations as physical keys on the phone.