From what I understand, an ASP is a process running on an AS, and a SGP is a process running on a SG. Each ASP SGP link is a SCTP connection.
Also, I understand that SGP is responsible for message-routing, while an ASP is merely an end-point for a SCTP connection.
Given that, are there any extra differences between a ASP and SGP (in addition to the routing-capabilities of a SGP)?