Jan  9 07:25:05 client1 /usr/local/sbin/kamailio[15318]: INFO: <script>: ACK rsponse: WebRTC --> WebRTC

Jan  9 07:25:05 client1 /usr/local/sbin/kamailio[15318]: WARNING: <core> [core/msg_translator.c:2812]: via_builder(): TCP/TLS connection (id: 0) for WebSocket could not be found

Jan  9 07:25:05 client1 /usr/local/sbin/kamailio[15318]: ERROR: <core> [core/msg_translator.c:2003]: build_req_buf_from_sip_req(): could not create Via header

Jan  9 07:25:05 client1 /usr/local/sbin/kamailio[15318]: ERROR: <core> [core/forward.c:549]: forward_request(): building failed

Jan  9 07:25:05 client1 /usr/local/sbin/kamailio[15318]: ERROR: sl [sl_funcs.c:372]: sl_reply_error(): stateless error reply used: I'm terribly sorry, server error occurred (1/SL)

Here it is saying that websocket connection is not found but when i check using netstat connection is in established state.

netstat -anp | grep kamailio

result :

53632 is same port as port mentioned in received field of location table.

So what can be the issue ? please provide your feedback on same.