Problem receiving Fax


I am trying to use iaxmodem and hylafax. I think I have well configurated iaxmodem and hylafax, but when I try to receive a fax I get this message in the console of Iax:

Unable to pass the full buffer onto the device file. 2015 bytes of 2052 written: Resource temporarily unavailable

Wich could be the problem?

Thank you