Bug#419888: Maybe working with newer version of spandsp

[Michel Meyers]

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I've managed to recompile asterisk with a snapshot release of spandsp
(probably what is to be 0.0.4 once it is released)

http://www.soft-switch.org/downloads/spandsp/spandsp-0.0.4pre1.tgz

I used:
http://www.soft-switch.org/downloads/snapshots/spandsp/spandsp-20070427.tar.gz

In addition to that, you need new apps from:
http://www.soft-switch.org/downloads/snapshots/spandsp/test-apps-asterisk-1.4/

The patch (use with -p0 in asterisk's root source dir) doesn't apply
cleanly (but the failed hunks can be added with some manual work).

Apart from that plc.h needs to be copied from that spandsp archive to
include/asterisk/plc.h.

Note though that I haven't performed anything but basic tests on the app
(it doesn't crash on me any more and seems to try to accept a fax).

Greetings,
       Michel
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