Subject: Re: [sipcore] [Sip-implementors] Initial NOTIFY without state information

From: "Dale Worley" <[email-masked]>
Date: Wed, 30 Sep 2009 17:18:09 -0400

On Tue, 2009-08-04 at 13:13 +0200, [email-masked] wrote:
> What should a notifier send in its initial NOTIFY if it doesn't have
> valid state information?

As you've described below, the definition of the event package is
supposed to contain that information.

> Do end devices handle NOTIFYs with an empty body properly?

A good question.  I expect that any subscriber would handle missing
bodies sensibly.  But it's a complicated question what "proper" handling
might be.

> What is a "neutral state"?
> RfC 3265:
> 'Documents which define new event packages MUST define
> this "neutral state" in such a way that makes sense for their application'
> 
> If they only would. Eg. RfC 3842 (MWI) doesn't seem to contain any hint about it.

A good point -- that's a deficiency in the specs.

Dale