The softphone (Asterisk) connected from the external device does not ring ( Retransmission timeout reached on transmission)?

Question

Asterisk

I am connected to internal subscribers from the outside through a static ip address. Phones are registered normally, calls go through. But after picking up the phone, nothing is heard and after 30 seconds the call breaks. At the same time, a message appears in the asterisk log:

What can it be? I read a lot of forums, tried to apply various parameters, still nothing happens. I attach the sip.conf file . The

call comes from 1004 to 1006 number. 1006 by analogy with 1004 is configured. Help!!!

Answer 1

So you closed the ports through which the voice goes :)
Add a rule like
iptables -A INPUT -p UDP --dport 10000:20000 -j ACCEPT

Answer 2

edit:

[general]
...
nat=yes

that's bullshit:
either so
permit=192.168.0.0/24
or so
permit=192.168.0.1/32
insecure=invite for type=friend and host=dunamic
is not needed