xpp: FXS: added a 'lower_ringing_noise' parameter

* Adds a new parameter, 'lower_ringing_noise', to module xpd_fxs.

* Makes the "power-down" behaviour that was added
  in upstream svn r10478, switchable in runtime.

* By default (false), makes the vbat_h behave like it did
  before the power-down change.
  - I.e: vbat_h is held throughout the ringing period (during
    both ring-up/ring-down)
  - So this patch revert part of r10478

* When switched to true, activate the "power-down" behaviour.
  - I.e: vbat_h follows the ring-up/ring-down.
  - This behaviour lowers the noise caused by group ringing of
    FXS channels in the same unit, but causes problems with CallerID.

Signed-off-by: Oron Peled <oron.peled@xorcom.com>
Acked-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>

Origin: http://svnview.digium.com/svn/dahdi?view=rev&rev=10574

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/branches/2.5@10578 a0bf4364-ded3-4de4-8d8a-66a801d63aff

0 files changed, 0 insertions, 0 deletions