Re: [Sip] cnonce in RFC 3261

[Tom Taylor <[e-mail]>]

Your basic problem is that you need to read the ABNF specification (RFC 5234)
to understand the syntax descriptions. That example you quoted:

nonce-count = "nc" EQUAL nc-value

species the syntax of a field which has the arbitrary name "nonce-count",
just for purposes of syntax description. The actual syntax is to the right
of the equals sign, and says that the field has the form:

nc= some value whose syntax is spelled oput by the production nc-value elsewhere 
in the ABNF.

The example you quote has this field:

nc=00000001

Moloud Mousavi wrote:
> Hi,
> 
> The Cnonce definition in RFC 3261 is confusing. This is what I found:
> 
> cnonce = "cnonce" EQUAL cnonce-value cnonce-value = nonce-value
> 
> 
> while a bit up an example shows the value of cnonce different than nonce:
> 
> nonce="dcd98b7102dd2f0e8b11d0f600bfb0c093", uri="sip:[e-mail]", 
> qop=auth, nc=00000001, cnonce="0a4f113b", 
> response="6629fae49393a05397450978507c4ef1",
> 
> I need to calculate the challenge response. I don't know where to get this
> cnonce from?
> 
> One more thing: Why are there many names for the same parameter??? Like this
> one: nonce-count = "nc" EQUAL nc-value
> 
> 
> THANKs a lot.
> 
> Moloud
> 
> 
> 
> 
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