多分出来るだろう、という事で取敢えず。
----------------------------------------
KURO-BOX:/#
KURO-BOX:/# pwd
/
KURO-BOX:/# tar zxvf /mnt/share/asterisk-1.2.15-kurobox-001.tar.gz
・
・
・
KURO-BOX:/#
KURO-BOX:/# reboot

Broadcast message from root (pts/0) (Sun Jun  8 16:33:10 2008):

The system is going down for reboot NOW!
----------------------------------------

"zaptel"を開始、ってモジュールが無いとか言ってます、
高負荷での音声制御らしいので今回は無視。
----------------------------------------
KURO-BOX:/home/tmp-kun# /etc/init.d/zaptel start
Starting Zaptel:FATAL: Module zaptel not found.
zaptel FATAL: Module ztdummy_kb not found.
ztdummy_kb.
----------------------------------------

無事動作です。
----------------------------------------
KURO-BOX:/home/tmp-kun#
KURO-BOX:/home/tmp-kun# asterisk
KURO-BOX:/home/tmp-kun#
KURO-BOX:/home/tmp-kun# asterisk -r
Asterisk 1.2.15, Copyright (C) 1999 - 2006 Digium, Inc. and others.
Created by Mark Spencer <markster@digium.com>
Asterisk comes with ABSOLUTELY NO WARRANTY; type 'show warranty' for details.
This is free software, with components licensed under the GNU General Public
License version 2 and other licenses; you are welcome to redistribute it under
certain conditions. Type 'show license' for details.
=========================================================================
Connected to Asterisk 1.2.15 currently running on KURO-BOX (pid = 1059)
KURO-BOX*CLI> quit
KURO-BOX:/home/tmp-kun#
----------------------------------------

"X-Lite"による"117"テストもOK！
Kernel2.6でもAsterisk 1.2は問題無しですね。