<div dir="ltr">Hi Danny,<div><br></div><div>the source causes could be many and it is difficult to analyse it without a full log and call trace.</div><div>This issue is usually printed when your kamailio instance is trying to send to a network that is not reachable via the interface it is running on.</div><div><br></div><div>For example kamailio in running on localhost and you are trying to send the package to a public interface.</div><div><br></div><div>Regards</div><font color="#888888"><div>Marco</div></font></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Aug 20, 2025 at 9:42\u202fAM Danny Cappellari via Spce-user <<a href="mailto:spce-user@lists.sipwise.com">spce-user@lists.sipwise.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg7945990111779840167">
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<div>Good morning, we're using SIPWISE 11.1.1<br>
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In /var/log/ngcp/kamailio-proxy.log, we see many errors like this:<br>
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Aug 20 09:38:44.685185 sbc1 proxy[2016]: ERROR: <core> [core/udp_server.c:810]: udp_send(): sendto(sock, buf: 0x7fe2df70fea0, len: 338, 0, dst: (x.xxx.xxx.xx:5060), tolen: 16) - err: Invalid argument (22)<br>
Aug 20 09:38:44.685212 sbc1 proxy[2016]: CRITICAL: <core> [core/udp_server.c:817]: udp_send(): invalid sendtoparameters#012one possible reason is the server is bound to localhost and#012attempts to send to the net<br>
Aug 20 09:38:44.685225 sbc1 proxy[2016]: ERROR: nathelper [nathelper.c:2431]: nh_timer(): sip udp_send failed<br>
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What are they due to?</div>
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