[Sip] Enrollment in SIP services (and should we undeprecate basic auth)

["Cullen Jennings" <fluffy@cisco.com>]

I have been thinking about how devices can easily enroll to some sip
service such as a registrar. In some cases it will be complex and
require credit cards and web pages but in some cases it could be very
simple. Imagine someone was offering a basic service and not directly
charging for it. It would be nice if I could send it a message and it
would create an account for me. 

It seems that a I could send a REGISTER to a registrar. If the registrar
had never heard of my user name before, it could just create it as a new
account. However, I would need to somehow provide it with the password I
wish to use. Using basic authentication over a TLS connection to the
registrar would be a nice way to do this. 

I'm wondering if we should undeprecate basic authentication. Is there
better ways to meet this requirement? Are there other uses for basic
that would support it coming back? 

Cullen

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