One could use a certificate that has a subjectAltName with a tel: URI or a DNS 
name ending with .e164.arpa.

Russ

> On Oct 12, 2022, at 5:35 PM, Eric Rescorla <e...@rtfm.com> wrote:
> 
> Yes, but (D)TLS is agnostic to credential format.
> 
> Would the certificate format in https://www.rfc-editor.org/rfc/rfc8226.html 
> <https://www.rfc-editor.org/rfc/rfc8226.html> serve your needs?
> 
> -Ekr
> 
> On Wed, Oct 12, 2022 at 2:11 PM Soni L. <fakedme+...@gmail.com 
> <mailto:fakedme%2b...@gmail.com>> wrote:
> Hello,
> 
> Is there a possibility to support E164 in X509, for DTLS over SMS?
> 
> Thanks.
> 
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