You could consider the Linksys NSLU2, been using one with 4 lines for 2 years, no problem. works fine with gsm, g711, or g729 (pass through).
http://www.nslu2-linux.org/wiki/Optware/Asterisk?from=Unslung.Asterisk http://www.voip-info.org/tiki-index.php?page=Asterisk+Linksys+NSLU2 http://tech.groups.yahoo.com/group/nslu2-asterisk/ http://www.ambor.com/public/home_pabx/home_pabx.html Ovidiu Sas takes part in the Yahoo! group, helped me resolve some problems before which I greatly appreciated. I believe he is also on TAUG mailing list.
