Asterisk auf 7140 39.04.47: keine audio (no audio) [eng]

[i started to learn german reading this forum, but better english]

After i updated to firmware 39.04.47 on my 7140 annex A english version, the asterisk doesn't work anymore as expected, it run, i can hear audio of others, but they don't hear me, also the moh (Music-On-Hold) test doesn't work anymore. the echo test (80) i hear the other part giving instructions, but i don't hear my self...

is there something new in the new firmware that need to be fixed to make asterisk work again?

i tried a reinstall, and for a moment it seemed to have worked, but only locally, when i'm on the same network.
when i connect from work to my home network with openVPN, and connect the sjPhone sip client to home, it doesn't work as before, one-way audio.

But it seems that i solved it by using IAX client, connects and echo test works.

i tried to do so when i was trying to connect with sip, but i was unable to make it work, as the remote computer is also behind a nat and it might complicate things.

anyway, it is working with vpn, ok there will be an overhead of data to transfer, and time to encrype/decrypt packages, but it is enough for my needs, and secure