>    Considering the behavior of UAS-2, my question is: whether any SIP 
> standard suggests guidelines on whether it is advisable to send out responses 
> from a UDP port which is different from the one on which the request was 
> received? RFC 3261 - 18.2.2 Sending Responses only talks about the 
> destination the response needs to be sent to, however nothing about the 
> source. 
>

Response are sent with help of Via. So whatever Port is mentioned in Via, 
response will be sent to that from UAS-2. Looks like in your example Via 
contains 2000. In case of TCP/TLS, response are sent to same connection (if 
still there) from where REQUEST was received. Pls confirm..

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