Fritz! Box 7020 v3 CO2 - SIP of problems of 2.PVC deactivates

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Hello,
I have here Fritz! Box 7270 v3 CO2, since my CO2 DSL only in July peeled will would like I gladly the box with my current T-Home connection to use.
I built an image with the current Freetz (74.X.80) and brought in.
Internet goes, also the Festnetztelefonie. Unfortunately my SIP account does not go, as it seems tries routs 2. To develop connection, although I everything which I forum found here deactivated. (see appendix of picture)
edit:
I Recover would not like to make I, since I do not know, from where I harsh-come then my CO2 DSL entrance data as well as CO2 SIP data. Since the box over a starting code with entrance data is fed.

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Annoying, 2. PVC deactivates and nevertheless apparently actively.

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Hello,
it should also go with the CO2 firmware, and if 2.PVC is developed nevertheless, then with that the VCI value to 32 to set

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So has again all attitudes with concerning. 2. PVC activates. Again this error message with the failed Internet connection came.
Restart and then the 2.PVC deactivated now seems again to function it *lol*. Do not become so quite smart from it.
Is important it goes .
Thanks for your assistance.

Sven