[SR-Users] Recommended configuration for TCP support

[Vitaliy Aleksandrov]

> What would happen in this case? If I understand correctly, the proxy 
> will always forward the request but the last hop (before the UAS) will 
> forward the request only if a connection is active?
>
correct.
>
> If the last hop doesn't forward the request because no TCP connection 
> exists, what happens? How the proxy will detect this situation?
>
It won't find any matching connection and won't try to establish a new 
one since you asked it to not. So it will just send a reply back to the 
registrar with an error. After receiving an error registrar in its turn 
can perform some smart actions like forwarding to a voicemail system.
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