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Mix 2 Mix 2: Caller is supporting approach 1 (REFER to caller) UA 1 is supporting approach 2 (REFER to park server) Park server is supporting approach 3 (KPML) Subscribe (message 3) gets rejected by UA 1 since it doesn’t support KPML UA 1 tries to REFER to park server on its own, but this is rejected by park server since it wasn’t expecting to receive REFER Park Server UA 1 Caller 1 2 3 4 |