One of the best ways I have found in understanding what kind of hardware works in LMCE is by looking at the user pages in the wiki. Just click on phenigma's user setup example link above.
Rule #1 - Be Patient - Rule #2 - Don't ask when, if you don't contribute - Rule #3 - You have coding skills - LinuxMCE's small brother is available: http://www.agocontrol.com
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Show posts Menuspeaker-test -D plughw:0,2
. Using aplay -L helped me identify that right device number.sudo asterisk -rvvvvv
, doing a 'sip show peers' or 'sip show registry'. All your phones should be registered. If not, track down why.