Hi, 

>>>Or, if I want the gruu returned, and I want to mandate the registrar
to support gruu, do I have to send:
>>>
>>>Instance-id AND Supported:gruu AND Require:gruu
>>  
>>
>GRUU draft, section 4.1 (extract from last paragraph):
>
>"If a UA wishes to guarantee that the REGISTER request is not processed
unless the domain supports and uses this extension, it MAY include a 
>Require header field in the request with a value that contains the
"gruu" option tag. This is in addition to the presence of the Supported 
>header field also containing the "gruu" option tag."
>
>So it looks like you need all three: +sip.instance, Require:gruu and
Supported: gruu.

I guess the text could say that "This is in addition to the presence of
the Supported header IF THE UA WANTS THE REGISTRAR TO RETURN THE GRUU." 

Because, the gruu itself will be created even without the Supported
header.

I am not sure that we before have defined a mechanism where an
option-tag may have to be present in BOTH the Require and Supported
header, so that is why I think the text needs to be really clear.

Thanks!

Regards,

Christer

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