Fax Problem - dahdi

Hy guys.

I’m having some trouble to send and reiceve faxes using asterisk.

To this, I’m using hylafax and iaxmodem.

I saw that problems only happen when there are another users making external calls.

I think that the problem can bem on the E1 link or in dahdi.

Where dahdi save his logs?

Best Regards,

PH