We're seeing an issue where some webRTC clients are not receiving inbound
calls. Kamailio logs show the following error:
WARNING: {1 609669922 INVITE [email protected]}: <core>
[core/msg_translator.c:3007]: via_builder(): TCP/TLS connection (id: 0) for
WebSocket could not be found
ERROR: {1 609669922 INVITE [email protected]}: <core>
[core/msg_translator.c:2086]: build_req_buf_from_sip_req(): could not create
Via header
ERROR: {1 609669922 INVITE [email protected]}: tm
[t_fwd.c:484]: prepare_new_uac(): could not build request
ERROR: {1 609669922 INVITE [email protected]}: tm
[t_fwd.c:1764]: t_forward_nonack(): failure to add branches
DEBUG: {1 609669922 INVITE [email protected]}: tm
[t_funcs.c:358]: t_relay_to(): t_forward_nonack returned error -2 (-2)
DEBUG: {1 609669922 INVITE [email protected]}: tm
[t_funcs.c:376]: t_relay_to(): -2 error reply generation delayed
It seems to be happening after the client has been connected to Kamailio for
more than 24 hours. The socket connection details look correct in the external
DB and in the output of ws.dump, core.tcp_list, and ul.dump.
A restart of Kamailio or a reload of the webRTC client, triggering a new
websocket connection, will clear the issue. However, we haven't been able to
determine exactly when and why a client ends up in this state.
While a client is in this state, REGISTER requests are still handled
successfully, they can make outbound calls and TCP keepalives from the client
are working.
I'm still working on trying to debug this with GDB so I can see what the value
of send_info is in
https://github.com/kamailio/kamailio/blob/master/src/core/msg_translator.c#L3007,
but I wasn't having luck with multiple child processes running, and now my
client has reloaded and is working again. I've restarted Kamailio with a single
child process, so when it does start failing again, I may have better luck with
GDB.
Any thoughts on what might be causing clients to get into this state? Whatever
additional information I can provide that might help, I'm happy to share.
Thanks!
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