My first Pull / Merge in the Kamailio project was to fix the IMS P-CSCF config
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Kamailio Proxy-CSCF Pull

My first Pull / Merge in the Kamailio project was to fix the IMS P-CSCF config
How the P-CSCF address is assigned to a UE in Protocol Configuration Options (PCO) during bearer establishment.
The exchange between a UE and P-CSCF to put SIP traffic into IPsec encapsulated payloads.
Viewing the payload of an Encapsulated Security Payload in Wireshark.