Hi, 

>Can a Stateless Proxy initiate CANCEL after forwarding INVITE ...???
> 
>  
> 
>UAC send INVITE to a stateless Proxy, this proxy does 
>Location service to get the next hop, but it could not get 
>the next hop from Location Service.
> 
>Then proxy should initiate4xx Reponse.

Yes. Since it did not forward the INVITE, there is no CANCEL to send.

Normally only forking proxies send CANCEL.  
 
>But how does a stateless proxy initiate Response ..???

In the same way as any other proxy, I would assume...

Regards,

Christer

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