3261 allows this.

Since the From URI doesn't have a role in routing messages, the 
infrastructure should deliver the request to some server responsible for 
the R-URI. Once it gets there, the recipient can reject the request if 
it wants. For instance you could return a 403 Forbidden response.

But if you don't have a great need to understand the From header you 
would be best to allow it.

        Thanks,
        Paul

On 4/24/13 6:02 AM, Sumant Gupta wrote:
> Hi,
>
> Can anybody explain me the behavior in case UE recieves the INVITE request
> with  "From" Header as:
>
> From: <http://www.mytest.test>;tag=1
>
> The difference in the above uri is that it is neither SIP/SIPS/TEL
> URI.Should we respond with 200 Ok for the above request?
>
> Regards
> Sumant
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