This change adds an echocan factory to dahdi-base that will allow hardware echo cancellation to use the same interface as the current software echo cancellers. The additions in this commit will not have any effect until the current HWEC mechanism is removed. Signed-off-by: Kinsey Moore <kmoore@digium.com> Acked-by: Shaun Ruffell <sruffell@digium.com> git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9520 a0bf4364-ded3-4de4-8d8a-66a801d63aff