There are a number of headers that may only appear once, including From, 
To, CSeq. IIRC this is addressed in the text relevant to each one.

        Thanks,
        Paul

On 11/9/2010 1:27 PM, SungWoo Lee wrote:
> Dear,
>
> Does 3261 specify the number of a certain header in a SIP message? We know 
> that multiple Via or Route headers are possible in a message. But what about 
> From header or To header? It obviously sounds weird, but can we put two 
> identical From headers(with same tag) in a single SIP invite request?
>
> Thanks,
>
> Sungwoo
>
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