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Mix 1 Mix 1: UA 1 uses REFER to caller (approach 1) Caller uses REFER to park (approach 2) Doesn’t even matter what park server does UA 1 sends REFER to caller Caller doesn’t need to support receipt of REFER in approach 2, so it fails REFER OR – caller supports REFER but just for transfer, so it informs the user the call is being transferred UI failure – the ‘unknown semantic’ for authorization and display Park Server UA 1 Caller UA 2 1 |