We have recently installed nextcloud-spreed-signaling by using this procedure: Setup nextcloud-spreed-signaling standalone server on Ubuntu | morph027_blog
while making call unable to receive calls by recipients, error received at signaling servers are: client.go:303: Error reading from IP: read tcp 127.0.0.1:8080->127.0.0.1:57956: use of closed network >
Used apache as a reverse proxy. Signaling servers connects successfully in nextcloud talk settings.
Sometime participants join call but not audio received and then trying to connect: following error i can caught from logs
janus: [ERR] [sdp-utils.c:janus_sdp_get_codec_rtpmap:763] Unsupported codec ‘none’
[ERR] [dtls.c:janus_dtls_srtp_incoming_msg:870]  – 1 (srtp_err_status_fail)