CHANGES:
skip non-regular files in /etc/iaxmodem (Julien BLACHE)
take caution against bad refresh negotiations from the server
update spandsp to snapshot 20070502 (adds V.17 rx support)
improve the ability to detect quiet signalling (spandsp: fsk min_power)
improve the sensitivity to carrier loss (spandsp: power_meter)
improve tcflushing when getty not reading pty and buffer fills,
prevents fast looping when buffer is filled
The source code for IAXmodem can be downloaded here: http://sourceforge.net/project/showfiles.php?group_id=148814.