GMX Voip Account- Genion

Hi

I have a question related GMX .. ( please feel free to reply it in German ... I can understand that )

I have currently O2-genion contract ... and I want to be called FREE of charge from another GMX or 1 & 1 Netphone ( Voip account )account ..

here is My question

If I register to GMX with my Genion Home number ( BUT NOT ONLINE during the call ) .... if someone calls me from a Netphone (VOIP) of another GMX account ..

will it be free for CALLER ?

or not ?

thanks

regards
Met

thanks Jens ....

so gmx is not something special :-(
any way .... Voip is still perfect
have a good day
bye
Met