MSN of 1&1 as fax number with analog line with FB 7170

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Hello.
I yesterday tried, the 7170 with new firmware to fax receipt/- dispatch to change over.

The following configuration:
- Analog line
- As fax NR I want to use a 1&1-interne call number
- Receipt over the intere fax of the FB, dispatch as email
- Dispatch over PC fax4fritzbox

All this folds also, but:

I am encountered the following problem:
The 7170 receives the calls on the main call number of T-Com (thus the similar call number) as fax.
What wrong I made?
Entries for internal fax number etc. naturally correctly set.
Can that be done at all?

Greeting & thanks!

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Hello, the internal fax number (1und1-Nummer) is probably registered with FON1, - 2 or 3. And/or the hook on all call numbers reacts set.
Greeting emen

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Hello.
I must examine - could be - thank for tap
Greeting