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Notwithstanding paragraph (c) of this section, a non-gateway intermediate provider must authenticate caller identification information using the Secure Telephone Identity certificate it received pursuant to paragraph (a) of this section for all calls it receives directly from an originating provider and for which the caller identification information has not been authenticated and which it will exchange with another provider as a SIP call, unless that non-gateway intermediate provider is subject to an applicable extension in § 64.6304.