The use of the non-specific "endpoint" is confusing

[martinthomson]

Given that the roles are relatively fixed with respect to who can send what here, using "endpoint" makes this hard to follow. If the idea is to allow a client might assign addresses to a server, then that's an extension.

[DavidSchinazi]

This is intentionally bidirectional: in the network-to-network use-case (see requirements doc), the client might provide the server with an address from the client's pool.