Kamailio is acting at upper layer in the IP stack, so it is not required by specs to do
any ICMP. Otherwise, it can only add some delay in sending out, because UDP is
retransmitted anyhow. Moreover, some hosts reject icmp by firewall/local policy, even if
they accept sip on 5060.
If some one wants to make a pull request, that can be reviewed and merged. But there is no
reason to have this on issues tracker. If someone think differently, add comments and can
be reopen.
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