Hi Sergey, Do you have experience running the "WS" transport in production?
I found a few mailing list threads mentioning issues with hung WebSocket connections, and that UDP is generally the recommended transport. I wanted to understand how reliable WS has been in real deployments. Regards Rajneesh On Sat, May 9, 2026 at 9:39 AM Sergey Safarov via sr-users < [email protected]> wrote: > Here is list supported transports > > https://github.com/kamailio/kamailio/blob/master/src/modules/rtpengine/rtpengine.c#L1331-L1343 > > For your work case "ws" transport. > > On Sat, May 9, 2026 at 4:20 AM David Escartin Almudevar via sr-users < > [email protected]> wrote: > >> Hi, >> >> We are investigating intermittent RTPengine NG control timeouts in a >> production setup and we would like to know if there is any supported way in >> Kamailio 6.0 to use TCP for the NG control channel towards RTPengine. >> >> Environment: >> >> * Kamailio 6.0.x >> * RTPengine 12.5.1.x >> * NG control currently over UDP (`udp:IP:7772`) >> >> Problem observed: >> Under real traffic load we occasionally see: >> >> ```text >> ERROR: rtpengine [rtpengine.c:4042]: send_rtpp_command(): >> timeout waiting reply for command "offer" from RTPEngine <udp: >> 192.168.9.70:7772> >> >> ERROR: rtpengine [rtpengine.c:4042]: send_rtpp_command(): >> timeout waiting reply for command "delete" from RTPEngine <udp: >> 192.168.9.70:7772> >> ``` >> >> We also observed: >> >> * Large NG replies from RTPengine (~7-9 KB UDP payloads) >> * IP fragmentation on the NG control traffic >> * `UdpRcvbufErrors` and `IpReasmFails` counters increasing on the >> Kamailio host >> * `Recv-Q` accumulating bytes on the UDP sockets between Kamailio and >> RTPengine >> >> We suspect the issue is related to fragmented UDP NG messages under load. >> >> We tried enabling TCP NG listener on RTPengine: >> >> ``` >> --listen-tcp-ng=IP:PORT >> ``` >> >> and configuring Kamailio with: >> >> ``` >> modparam("rtpengine", "rtpengine_sock", "tcp:44.228.222.190:22222") >> ``` >> >> but Kamailio logs: >> >> ``` >> Sep 12 08:01:03 ip-10-100-10-19 /usr/local/kamailio/sbin/kamailio[4602]: >> WARNING: rtpengine [rtpengine.c:1002]: add_rtpengine_socks(): Node address >> must start with 'udp:' or 'udp6:' or 'unix:'. Ignore 'tcp: >> 44.228.222.190:22222'. >> ``` >> >> Questions: >> >> 1. Is TCP transport for RTPengine NG control supported in any Kamailio >> 6.0 version? In that case, how can it be configured? >> 2. Are there any recommended practices for large NG replies under high >> load? >> >> Any guidance or experience would be appreciated. >> >> Thanks a lot and regards >> david escartin >> __________________________________________________________ >> Kamailio - Users Mailing List - Non Commercial Discussions -- >> [email protected] >> To unsubscribe send an email to [email protected] >> Important: keep the mailing list in the recipients, do not reply only to >> the sender! >> > __________________________________________________________ > Kamailio - Users Mailing List - Non Commercial Discussions -- > [email protected] > To unsubscribe send an email to [email protected] > Important: keep the mailing list in the recipients, do not reply only to > the sender! >
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