On 7 Dec 2016, at 5:08, David Hofstee wrote:
> The X- type headers are deprecated... https://tools.ietf.org/html/rfc6648
Not entirely:
This document generalizes from the experience of the email and SIP
communities by doing the following:
[...]
4. Makes no recommendation as to whether existing "X-" parameters
ought to remain in use or be migrated to a format without the
"X-"; this is a matter for the creators or maintainers of those
parameters.
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