3270 as masters - 7050 as Slave????

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Hello,
I have the following configuration:

Master box: 3270 (Versatel Flat 6MBit)

Slavebox: 7050 (make possible VoIP with Arcor is to latch itself on the 3270 by WLAN and)

Result is:
At the Slave box Internet runs perfectly by WLAN and also the Voice of over IP software (Arcor language software)
As soon as I a telephone to the 7050 attach and the whole thereby to test want fold nothing more.
In the Slavebox are correctly registered the Arcor Telefonie data, what I also in Web-front-end the 7050 see can (with telephone number xxxxx registers…)
Also the STUN server is registered.
Read I that DHCP is to be switched off, also that I already tried - it does not fold.

As soon as I attach the 7050 Slavebox to 7140 a master box (with Arcor Zugangsdaten), everything functions like it is.

Now it could actually be only two sources of error:
1. Versatel????
2. the 3270 makes with these Konfig problems…

What do the professionals say to this problem?
Make me happy on answers

Thanks in advance

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No one tap?
To despairing…

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Hello,

you tried all haven to the 7050 and here read and here searched?