It usually happens when the SIP service provider of the destination 
endpoint modifies the request URI  (which actually carries the AOR) with 
the current location registered with location service.

Manish Jain wrote:
> Recently I have observed a call flow (INVITE transaction) in which user name 
> in requri and To-uri is different. In which conditions/scenerios, it can 
> happen and what may be the purpose.
>
> Best Regards,
> Manish Jain
>
>
>
>
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>
>   

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