location /ws {
        proxy_pass https://$freeswitch_addr:7443;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header X-Forwarded-Proto https;
        proxy_set_header X-Forwarded-Ssl on; 
        proxy_read_timeout 6h;
        proxy_send_timeout 6h;
        client_body_timeout 6h;
        send_timeout 6h;
}