[Sipping] Re: inconsistency between RFC4235 (Dialog package) and gruu-reg-event-09 example

[Paul Kyzivat <[e-mail]>]

Jeroen,

The gruu-reg-event draft doesn't define the unknown-param element - that 
is defined in RFC3680. I had need to use that in an example, and did it 
the way I thought was consistent with 3680, even if it happens to be 
inconsistent with 4235 which defines a different element for the purpose.

I'm going to have to consult with Jonathan, as author of 3680, about 
this. It seems that you may be asking for gruu-reg-event to act as a 
clarification/revision of 3680 as well as an extension. That would be a 
significant change at this stage of the game.

There is also an issue that 4235 doesn't talk about. The "<" and ">" are 
there for a reason in callerprefs. They are needed for callerpref values 
that contain strings, but not for callerpref values that contain other 
sorts of values. Removing them loses the significance. We may need to 
hunt back to dig out the reasoning about this.

	Thanks,
	Paul

Jeroen van Bemmel wrote:
> Paul,
>  
> Regarding '<' '>' around instance-id in XML:
>  
> In RFC4235 (Dialog event package) it is explicitly stated in 4.1.6.2:
> [...] Note that any quoting (including extra angle-bracket quoting used 
> to quote string values in [10]) or backslash escaping MUST be removed 
> before being placed in a pval attribute.
>  
> [10] refers to RFC3840 "Indicating User Agent Capabilities in the 
> Session Initiation Protocol (SIP)"
>  
> RFC3680 (reg event package) does not discuss this. The examples in 
> gruu-reg-event all use '&gt;' '&lt;' XML encoding for the '<' 
> '>'  characters around the instance id in "unknown-param" elements. For 
> consistency with RFC4235, I think they should be omitted.
>  
> Regards,
> Jeroen


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