Please read the above for TLS/HTTP interactions relevant
to implementing IPP clients and printers.
Also, please see
RFC 2818 - HTTP over TLS (Informational)
- how to use 'https:' URLs and operate HTTP over TLS
RFC 2806 - 'tel':, 'fax:', 'modem:' URLs (Proposed Std)
- international (E.164) w/ support for subaddresses, etc.
- Ira McDonald, consulting architect at Xerox and Sharp
High North Inc