[help] "Unable to open DAHDI pseudo device"

The same problem (“Unable to open DAHDI pseudo device”) occurs.

OS: Debian 6.0.7
Linux: 2.6.32-5-686 #1 SMP Mon Feb 25 01:04:36 UTC 2013 i686 GNU/Linux
Asterisk: 1:1.8.11.1-1digium1~squeeze

sources.list:

deb http://security.debian.org/ squeeze/updates main contrib non-free
deb-src http://security.debian.org/ squeeze/updates main contrib non-free

deb http://ftp.debian.org/debian/ squeeze-updates main contrib non-free
deb-src http://ftp.debian.org/debian/ squeeze-updates main contrib non-free

deb http://mirror.yandex.ru/debian squeeze main contrib non-free

deb http://packages.asterisk.org/deb squeeze main contrib non-free
deb-src http://packages.asterisk.org/deb squeeze main contrib non-free

What I’ve installed (to be able to use Page application, which requires MeetMe, which requires timing working):

apt-get install dahdi
apt-get install dahdi-source
apt-get install dahdi-linux
apt-get install asterisk-dahdi

‘modprobe -l’ and ‘lsmod’ do not show anything like zapata/zaptel/ztdummy/dahdi.

So, when i use ‘Page’ application in my dialplan, I have an error (in fact, both phones, 1000 and 1004, ring when I dial ‘113’ from my 1001 phone, but for about 1 second only, then the call suddenly hangs up):

-- Executing [113@myphones:1] Page("SIP/1001-00000000", "SIP/1000&SIP/1004") in new stack == Using SIP RTP CoS mark 5 -- Called 1000 == Using SIP RTP CoS mark 5 -- Called 1004 -- SIP/1004-00000002 is ringing -- SIP/1000-00000001 is ringing -- <SIP/1001-00000000> Playing 'beep.gsm' (language 'ru') [May 16 11:26:06] WARNING[1115]: app_meetme.c:1228 build_conf: Unable to open DAHDI pseudo device == Spawn extension (myphones, 113, 1) exited non-zero on 'SIP/1001-00000000'