By default the phone doesn't listen on the sip_tls_listen_port for TLS connections. To change this behavior, enable this option.
See also tcp_listen.
Advanced → SIP/RTP → SIP → Listen on SIP TLS Port
N/A
Parameter | Valid value |
---|---|
<tls_listen perm="PERMISSIONFLAG">VALIDVALUE</tls_listen> | on, off |