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I'm not seeing the correlation between '"providers need[ing] to stay involved" and "the potential for abuse by cold callers". But one reason the provider needs to stay involved in the call is because the provider provides call control facilities (with optional media) which require the media to flow through their equipment, not least of which Lawful Intercept (LI). But also media conversion, e.g., PSTN / VoIP / mobile, RTP rate conversion (packet rate), codec conversion.