[Spce-user] Kamailio-Proxy - sip udp_send failed

[Marco Capetta]

Hi Danny,

the source causes could be many and it is difficult to analyse it without a
full log and call trace.
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.

For example kamailio in running on localhost and you are trying to send the
package to a public interface.

Regards
Marco

On Wed, Aug 20, 2025 at 9:42 AM Danny Cappellari via Spce-user <
spce-user at lists.sipwise.com> wrote:

> Good morning, we're using SIPWISE 11.1.1
>
> In /var/log/ngcp/kamailio-proxy.log, we see many errors like this:
>
> 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)
> 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
> Aug 20 09:38:44.685225 sbc1 proxy[2016]: ERROR: nathelper
> [nathelper.c:2431]: nh_timer(): sip udp_send failed
>
> What are they due to?
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