SIP over VPN. Why is there no registration?

Question

Asterisk

Good afternoon Colleagues!
There is an IP PBX MyPBX (network 192.168.5.0/24) there are phones in the local network (the network is also 192.168.5.0/24). IP of all devices is static, in LAN they are registered on the PBX and work, everything is ok.
There is a remote network (192.168.11.0/24) connected through a VPN tunnel at the router level. In that network there is a device with IP 192.168.11.253. Routes on both routers are registered. Pings go, I get into a web a face of the device, but registration on automatic telephone exchange does not transit. I think the problem is somewhere in the PBX settings, but I can't figure out what exactly to configure there.
I am a layman in setting up MyPBX and other Asterisk)

Answer 1

Varya shark, and besides, there are debugging mechanisms in the asterisk itself.
Are requests coming from the host (phone) to the PBX? Does the answer go in the right direction?

Answer 2

Perhaps in the PBX itself, connections are allowed only from its subnet? or white sheet is configured
where in MyPBX, unfortunately I can’t tell you

Answer 3

In the asterisk in sip.conf in the "general" section
localnet=192.168.5.0/24
localnet=192.168.11.0/24
In MyPBX I don't know where, like in the "SIP Settings - NAT" Local Network settings

Answer 4

Everyone in MyPBX has some kind of logs, you need to look at them. Maybe it's just the wrong password.
In the settings of sip accounts there is a section section of allowed ip. See more there.
Nat is definitely not used?