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This is an attempt to make 3GPP TS 23.228 more approachable, starting with the basic requirements of IMS for VoLTE and deconstructing it into base parts.
Minor technical corrections:
- PCRF's C is "Charging" (I will always screw that up).
- In IMS roaming it's a pull procedure between the visited network's PCRF, not a push (I drew the line in the wrong direction).
- I meant to say PCRF was defined within the 29 series, not 32 series. Somehow charging and policy always blur together in my mind.