Why is the Cisco spa303-g2 registering on asterisk but not accepting incoming calls from outside?

Question

Asterisk

It costs asterisk 11
There is an external ip XXX.XXX.XXX.XXX and an internal 192.168.3.1
There is a cisco spa 303-g2 firmware 7.5.5 ip 192.168.3.55
[103]
type=friend
username=103
secret=password
context=my_phones
host=dynamic
qualify=200 Name/username
Registered on asterisk
Host Dyn Forcerport Comedia ACL Port Status Description 103/103 192.168.3.20
D Auto (No) No 5060 OK (10 ms) call from outside, I get status is 'CHANUNAVAIL'

Answer 1

Question, closed, found an error in the dial plan, so the phone did not receive external calls

Answer 2

Does a different model phone set to this number behave the same way?
This phone, set to a number that works normally with another phone, behaves the same way?

Answer 3

Another d-link phone behaves normally to this number.
And if the spa 303 is set to the multiphone directly, it works fine.