Hi,

>According to the rfc3261, the userinfo in the sip-uri is optional.
>If there is no userinfo part then there should not be any "@" sign as well in 
>the sip-uri.

Correct.

>I have couple of questions
>
>1) If I am receiving a sip request without userinfo part in the sip-usri, 
>starting with "@" then is it a malformed packet?

It’s a malformed SIP URI.

>2) What should be the standard behavior of SIP server while responding to such 
>packets?

Send a response with an error response code.

Regards,

Christer


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