[sr-dev] [kamailio/kamailio] When using t_relay to convert sip message udp to tcp, the source port changes (Issue #3069)

[zhangyang]

  My cfg file is written like this ：
$du = "sip:"+$rd+":"+$rp+";transport=tcp";
![image](https://user-images.githubusercontent.com/16113837/160795856-945514d5-b36b-4b1a-95a1-41d60bf0de7a.png)


when i use 
$du = "sip:"+$rd+":"+$rp+";transport=udp";
the sip message will be normal 
![image](https://user-images.githubusercontent.com/16113837/160796099-0d498eb2-e6a8-4703-9f4a-0e7d9b069bef.png)
excuse me, can you tell me the reason ?

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