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From: [email protected] 
[[email protected]] On Behalf Of Harbhanu sahai 
[[email protected]]

>To phrase it more clearly, devices MUST send upper-case here, but they
>MUST accept both upper-case and lower-case and mixtures thereof.
>Dale

Does it mean that peers sending in lower case, or any other permutation, is 
complaint 3261 peer?
Or is this provision incorporated within implementations to allow error 
tolerance ?

As per my understanding there are other texts in RFC which overlays some more 
rules over the BNF, such as  the one for name-addr usage, when addr-spec 
contains comma etc, in Contact like headers.

In other words, as per the text - "The SIP-Version string is case-insensitive, 
but implementations MUST send upper-case"
Does 3261 doesn't mandate any UAC to send version string in upper-case ?
And thus any UAC which doesn't do so isn't non-compliant to 3261 ?
To be precise - Is that ETSI testcase for 3261 conformance correct ?
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What is the purpose of the ETSI test case?

My understanding is that it is to test whether your device complies, in 
particular, that it *accepts* non-upper-case input.

You are correct that no 3261-compliant device will *send* such a string.  But 
that is not the question -- your device is required to *accept* such a string 
anyway.

Dale

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