Richard Brady writes:
i didn't find in rfc5626 a requirement that registrar should remove 430 flow contact,
Closest I can find is:
"EP1 no longer has a flow to Bob, so it responds with a 430 (Flow Failed) response. The proxy removes the stale registration and tries the next binding for the same instance."
it is thus the job of the proxy, not the registrar, to remove the currently unusable registration. the proxy could do it either by sending un-REGISTER request to registrar or via an mi/rpc command. the former is possible now. the latter requires that instance and reg_id params are added to ul_rm_contact mi command.
-- juha