Getting the "CC instance to register in a trunk"

Hi, everyone.

We've been asked if it is possible to get an instance of CCtr to "get to register" in an IMS proxy or alternatively in a sip trunk.

I'm not quite sure what the person asking this to happen means because as far as I know "registering" is a function for a sap endpoint, like a VOIP phone running an account.

Also as far as I know regarding SIP an instance of CCtr is not an endpoint, but rather a middleman that manages allocating and connecting SIP sessions.

So, is there anyone who could clarify this for me?

Best wishes,
Jaanus