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List:       sip-implementors
Subject:    Re: [Sip-implementors] SIP URI header
From:       Marco Ambu <marco.ambu () abbeynet ! it>
Date:       2006-07-20 6:33:18
Message-ID: 44BF23AE.6070101 () abbeynet ! it
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Nir Hasson ha scritto:
> Hi all,
>
> In RFC4475 (SIP torture), the following Request-URI considered to be
> illegal, because it contains escaped header (%3C, %3E):
>
> sip:user@example.com?Route=%3Csip:example.com%3E SIP/2.0
>
> But, looking at the BNF rules at RFC3261 (below) it seem that header 
> can be
> escaped (definition of hname for instance).
> Am I missing something?
>
>
>   
[cut]

In general the headers must escape all disallowed characters.

Please refer also to rfc 3261 table 1 page 152 to see what URI's 
components are allowed in the several fields in which URIs can appear. 
As you will see, headers are not allowed in request-URI field. On page 
151 it is stated that "Elements processing URIs SHOULD ignore any 
disallowed components if they are present."

For the implementation your UAC MUST not generate a request-URI with 
headers, and your UAS SHOULD ignore any headers in request-URI in a 
received request.
So the posted example must not be generated by a UAC, but should be 
processed by a UAS.

-- 
Marco Ambu
Abbeynet S.p.a. <http://www.abbeynet.it>
E-mail: marco.ambu@abbeynet.it
VoIP address: <sip:210000016@sip.abbeyphone.com>

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