[sr-dev] Re: [kamailio/kamailio] core: local TCP socket is bound on listening address (PR #3925)

This PR is for a use case when Kamailio is listening `dummy` network interface and `tcp_reuse_port` is not used. In this case, a new TCP connection will be sent from an IP address not listened by Kamailio.

But if you enable `tcp_reuse_port=yes` in this case new outbound TCP connection will be from the correct IP address.

This PR allows create a new TCP connection from the IP address listened by the Kamailio. In case when Kamailio listens on "dummy" interface.

@ivanuschak could comment about ``` - *from = &si->su; + memcpy(*from, &si->su, sockaddru_len(si->su)); ```