dahdi_cfg: minor: Rename fo_real to dry_run

Minor readability change

Signed-off-by: Russ Meyerriecks <rmeyerriecks@digium.com>
Acked-by: Shaun Ruffell <sruffell@digium.com>
dahdi_cfg: Reduce mass ioctls on non-existing channels

Logic was calling DAHDI_SPECIFY ioctl on all channels up to maximum channel
limit. Added a short circuit to prevent the ioctl on channels that aren't
configured.

Signed-off-by: Russ Meyerriecks <rmeyerriecks@digium.com>
Acked-by: Shaun Ruffell <sruffell@digium.com>
zonedata: Ensure all zones have a default DAHDI_TONE_DIALRECALL.

The default 'us' tone is most likely better than silence when Asterisk tries to
generate the recall tone on a DAHDI channel.

Internal-Issue-ID: DAHTOOL-63
Reported-By: Igor Kravets
Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Signed-off-by: Russ Meyerriecks <rmeyerriecks@digium.com>
tonezone: Fix congestion tone for Australia

The Congestion tone in Australia must be reduced by 10 to 15 dB
at every other cadence and the frequencies for both at cadences are 425 Hz.

From: Armen Karlozian <armeniki@hotmail.com>
Signed-off-by: Russ Meyerriecks <rmeyerriecks@digium.com>