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Hi, I'm used to add OSLEC source code into asterisk and use it as default echo canceller. Currently, I'm proceeding this way: download the kernel source code roughly matching the kernel version I'm targeting with command such as "wget http://kernel.org/pub/linux/kernel/v3.0/linux-3.2.46.tar.bz2" copy the echo subtree into dahdi change dahdi's Kbuild file (for dahdi