Source Text

Notwithstanding paragraph (c) of this section, a gateway 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 that use North American Numbering Plan resources that pertain to the United States in the caller ID field 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 gateway provider is subject to an applicable extension in § 64.6304.