[EMAIL PROTECTED] wrote:

> If I recall correctly, there are three extensions or proposed
> extensions that use Require headers in responses routinely.  One is
> the GRUU extension, but I've forgotten the other two.

RFC3262 (PRACK) uses 'Require: 100rel' in provisional responses, to
trigger a PRACK (along with the RSeq header).  Maybe this is what you
remember?

Best regards,

Michael


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