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Using Asterisk in Debian to set up Conference Calling



I have a Debian Etch server running asterisk

I am trying to set up conference calling with the MeetMe command.

However when ever I enter an extension which uses this command, 
everything falls apart and asterisk ends up exiting

My meetme.conf

[general]
[rooms]
conf => 61
conf => 62
conf => 63
conf => 63


My extensions.conf
exten => 60,1,Answer()
exten => 60,2,MeetMe(,EMxp) 



When I enter extension 60 I enter a conference - I get repeated 

"you are entering conference 6 1 that is not a valid conference number 
you are entering conference 6 1" etc

CPU load rises to near 100% from mpeg123 and asterisk has exited.  This 
seems to be the same if I take the M of the options (ie no music on 
hold).

It appears to be something related to the the zap device

Mar 23 15:55:49 WARNING[19849]: chan_zap.c:913 zt_open: Unable to 
open '/dev/zap/pseudo': No such file or directory
Mar 23 15:55:49 ERROR[19849]: chan_zap.c:7518 chandup: Unable to dup 
channel: No such file or directory
Mar 23 15:55:49 WARNING[19849]: app_meetme.c:465 build_conf: Unable to 
open pseudo channel - trying device
Mar 23 15:55:49 WARNING[19849]: app_meetme.c:468 build_conf: Unable to 
open pseudo device


I presume, being the Debian binary package, that I don't have the 
ztdummy driver installed.  On the otherhand I read in viop-info.org 
that that wasn't necessary with Linux 2.6 (I am running 2.6.18).

Where do I go from here?

-- 
Alan Chandler
http://www.chandlerfamily.org.uk



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