This adds module parameter 'ring_trapez'. When set, the wave form of
the ring tone is set to be a trapezoid, rather than sine. Thus making
the ring stronger.
This is a boolean parameter of the module xpd_fxs. Takes effect at the
beginning of the next ring.
Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@10022 a0bf4364-ded3-4de4-8d8a-66a801d63aff