> What is desired behavior for in dialog response 
> to request?

The INFO 500 doesn't terminate a dialog.  However depending upon the
importance of a successful INFO, the UAC may decide to terminate the
dialog by sending BYE.


> For instance:
> 
> UAC                      UAS
>    | ----- INVITE ----->  |
>    |  <-------- 100 ------- |
>    |  <-------- 180 ------- |
>    |  <-------- 200 ------- |
>    | ----- ACK -------->  |
>    | ----- INFO ------->  |
>    | <-------- 500 -------- |
> 
> 
> After sending 500 UAS should not receive 
> DialogTerminated event, should it?

See above.

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