CHANGES:
kill -HUP now makes the modems wait to restart when they're on-hook
improve IAX2 call rejection when the modem is busy by using
REJECT instead of ACCEPT+CONGSTN+HANGUP
add "nodaemon" config file feature
add "iax2debug" and "dspdebug" config file features
update spandsp to 20080110 snapshot
update libiax2 to current iaxclient/lib/libiax2 + patches
The source code for IAXmodem can be downloaded here: http://sourceforge.net/project/showfiles.php?group_id=148814.