Fritz box behind Fritz box - VoIP General, VoIP News, VoIP Providers, VoIP hardware, VoIP software, VoIP Technology

Hello,
My plant is so developed:
Telephone connection --> FRITZ! Box hair dryer WLAN 7240 --> Linksys rout --> FRITZ! Box hair dryer 5012

The first Fritz box serves modem as DSL and for telephoning.
By this Fritz box all haven on rout passed on, this serves then as Firewal, WLAN rout and everything else.

Now I wanted to operate however additionally a Fritz box with an old ISDN Telfon.

The question is, funtkioniert berhaubt?

Raustelefonieren is not a problem, which funtkioniert.
Coming in calls do not only come purely.
There are here HowTo in addition, but that did not really help me.

The IPs all to rout passed on on the Fritz box.

Single haven Forwarding:

Haven rank Forwarding:

Haven rank Triggering:

I registered the Stun server to Zustlich into the box:

Since there the problem is that the Fritz box does not notice if IP change was I the number again announce let. Habs tries out, but it does not go.
Get always that here:

And that should is called actually that the password is not correct.
That is correct however, raustelefonieren functioned.

And for the problem that the Fritz box does not notice the IP change was gives it actually also a solution, but for one needs telnet.
The problem thereby is, which if I announce myself over telnet, gets I every few seconds this message:

Which is to always be called.

It is actually only the problem which one on this telephone no calls get can.
Can that be because of it it simply does not futnkioniert ne Fritz box behind a Fritz box to operate? Or is the error because of me?

I hope to help that me one can,
MfG LittleDestroyer

Has the 7240 a SIP Registrar? If, then use these for the Registierung of the 5012 have you still the nut with the NAT of the Linksys to then crack, but that should have to be created.

Naja, know me there nich completely soo out.
Have none ahung whether sowas has. ^^