Anybody knows if each 'socket' specified in routes struct should be use to send the messages?

The socket is configured in kamailio.

In kamailio.cfg

listen=udp:172.16.213.38:5060

json struct

"routes": [

In our kamailio has two eth and I want to select which one to use but I can't make it work through rtjson. 

In the code of the module I can't find where is being assigned the socket.  

Thanks in advance!

Diego