There are a couple of issues that might be a problem here. Firstly, although Clearwater is used as the IMS core in VoLTE networks, the Bono node doesn't support AKA authentication and so probably won't work as a VoLTE P-CSCF.
Secondly, the phone you are using might be whitelisted to only support VoLTE on certain PLMNs. You should check that the phone is making DNS queries and trying to send SIP. Until the phone is attempting to SIP REGISTER with Clearwater, then there is nothing Clearwater can do. 1) Looks plausible, and yes, you'll need to change Clearwater configuration. 2) Yes, you'll either need to own that DNS, or configure OpenAirInterface EPC to send the P-CSCF IP address to the UE. 3) It's not required to have Clearwater and your EPC talking to the same HSS Good luck!
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