[asterisk-users] Asterisk Drop call

[Roberto]

Hello
I have an asterisk 16.2.1 on an ubuntu on AWS, which is experiencing a 
drop in call. It does not have a certain time, it is random. The audio 
is flowing normally and the call is dropped.
Has anyone ever experienced this?

My settings changed below:

allowoverlap = no
udpbindaddr = 0.0.0.0
tcpenable = no
tcpbindaddr = 0.0.0.0

transport = udp, ws, wss

srvlookup = yes

directmedia = no

rtcachefriends = yes

externaddr = my ip address

externhost = my domain address ;   foo.dyndns.net; refreshed periodically
externrefresh = 180

       localnet = 172.31.40.21 / 255.255.240.0; AWS NETWORK
       localnet = 192.168.0.0 / 255.255.0.0; RFC 1918 addresses
       localnet = 10.0.0.0 / 255.0.0.0; Also RFC1918
       localnet = 172.16.0.0 / 12; Another RFC1918 with CIDR notation
       localnet = 169.254.0.0 / 255.255.0.0; Zero conf local network
       localnet = 200.0.0.0 / 24
       localnet = 191.0.0.0 / 24
       localnet = 201.0.0.0 / 24
       localnet = 177.0.0.0 / 24

       localnet = 179.0.0.0 / 24


Thanks

Roberto.