Modelling Non-Standard Circuit Terminations

[akgerrish]

Hi all, I have a question about how best to model a circuit that's a little unusual, at least within our environment:

I have a circuit from a transit provider that terminates on an edge router at site A via a connection to the carrier's device (also at site A), but the carrier uses fiber which arrives on campus at another one of our sites (C) and traverses site B on its way to A via patch panels that we model in Netbox. How would you model this?

My initial inclination is to have the circuit still terminate on our edge router at site A, and mark the front ports the provider takes up as connected with an explanation in the FP descriptions, because we generally don't have a lot of information on the devices our providers have on campus and it's more convenient to leave out those details. One alternative could be to model the provider's device and terminate the circuit at site C. I dislike this approach because it obscures the fact that our edge router's interface is connected to a particular circuit, but I'm not sure what's best. Curious to know how others deal with situations like this.