[SIPForum-discussion] Query regarding Require and Supported

Donald Lee baolovebao at gmail.com
Tue Aug 21 08:54:33 UTC 2007

not exactly. actually, it has differenct meaning in those headers. Pls refer
to RFC3262

8.1 IANA Registration of the 100rel Option Tag

   This specification registers a single option tag, 100rel.  The
   required information for this registration, as specified in RFC 3261,

      Name: 100rel

      Description: This option tag is for reliability of provisional
         responses.  When present in a Supported header, it indicates
         that the UA can send or receive reliable provisional responses.
         When present in a Require header in a request, it indicates
         that the UAS MUST send all provisional responses reliably.
         When present in a Require header in a reliable provisional
         response, it indicates that the response is to be sent

On 8/21/07, chandan kumar anjani <chandan.anjani at gmail.com> wrote:
> Hi,
> In Require and Supported header does the 100rel means 100% reliablility is
> expected
> or it is that all 1XX should be reliable.
> Bye
> Anjani
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