I'm curious how CDR mediation is done if you are connecting to someone like L3/XO/Qwest via SIP. Do upstream proxies pass the BYE messages back down the proxy chain so you get a full CDR? Or is there some sort of API you query that gives you call records straight from a SBC?

We are adding some (hopefully) useful voip billing functionality to our payment gateway, and are trying to get a better understanding of how CDR records are typically collected by larger providers. I've gleaned a little information from reading up on SIP and looking at the SER docs, but a lot is still fuzzy.

Chris

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