UPDATE Method handling in SIP RA
Again goes back to the Automatic Dialog Support business and I suppose it can be handled by adroit documentation. If an UPDATE arrives and a Dialog does not exist for the UPDATE, a User Agent (endpoint) should reply "481 Call/Transaction Not found" whereas a proxy should just proxy it. Trouble is, with Automatic Dialog Support disabled, the stack cannot tell what to do. Therefore this should be documented as being the responsibility of the Application.