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RE: Last Call: draft-lawrence-sipforum-user-agent-config (Session Initiation Protocol (SIP) User Agent Configuration) to Informational RFC

2010-04-05 14:10:11


-----Original Message-----
From: Scott Lawrence [mailto:xmlscott(_at_)gmail(_dot_)com]
Sent: Monday, April 05, 2010 2:30 PM
To: Hadriel Kaplan

The spec says in section 2.6
(Validity of Stored Configuration Data):

        The UA MAY use configuration data that is of unknown validity,
        or configuration data that is known to be no longer valid, while
        attempting to revalidate that data or obtain new data.

So the UA may use the configuration data before any subscription is
established - the subscription does not block anything (except getting
change notices).

Heh... weren't you just arguing about how optional requirements in IETF docs 
are bad?  ;)

This form of optional is right up that alley.  For example, if I am a service 
provider who wants to not have Subscription mode, and the only way to do it is 
through UA config framework itself by setting a config field for 
"Subscribe-UA-Config="false" or whatever, then clearly the UA's MUST use the 
config.  A MAY statement does nothing.

If it's not clear and exact as to what config data a UA is supposed to use, and 
when, then you really do get "flaky service behavior" as you were worried about 
in a previous email.

-hadriel
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