If you refer to the urban legend that IAX always needs a server to stay in the media path, then you would be wrong. IAX has a mechanism that for all practical purposes is equivalent to a SIP reinvite through which the end points then transition to a mode by which they communicate directly peer to peer.
With SIP and reinvites the server still stays in the signaling path (but not the audio path). This makes CDRs accurate. With IAX there is no way for the server to have correct CDRs because it never knows when the call has ended. As far as an IAX server is concerned the call ended when the transfer happened.
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