[Serusers] Bad Request - Invalid IP address

[radan]

Hi !
I don't know that is a ser problem
but I cannot make a call from ATA-186 ( with analog phone)
to PSTN phone via my gateway.
I receive 400 Bad Request - Invalid IP address
If I call to IP everything is ok.

I don't have this proble when I call from softphone like kphone
to PSTN phone.

Did somebody have similar problem ?
Which version of ATA software do you use ?

Regards 
Andrzej