Who can with whom?

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I rumgeschnffelt times with “Onlinekosten.de” a bischen and me some was noticeable in such a way there.

1.)
Tariffs net-internally (WEB.DE):
Calls between Web.de customers free of charge,
Calls for 1&1, 3U, freenet, GMX, Interfoni customers free of charge,
Calls for Nikotel, Schlund+Partner, VoipGate, Outbox and Sipgate customers free of charge.

2.)
Tariffs net-internally (1UND1):
Calls between 1&1-Kunden free of charge,
Calls for GMX and. Web.de customer free of charge.

3.)
Tariffs net-internally (GMX):
Calls between GMX NetPhone customer free of charge,
Calls between 1&1-DSL plus users free of charge.

4.)
Tariffs net-internally (freenet):
Calls between freenet customers free of charge,
Calls too sipgate, sipphone, Strato and web.de customers free of charge.


Hot that is the discussion from Web.de to GMX is free, but a discussion from GMX to Web.de is liable to pay the costs?

Is there a table for “free discussions” (from which Provider to which Provider)?