Wav sound which is reading by Asterisk

[root@asterisk1]# sox 2.wav -r 8000 -c 1 -s -w redhat1.wav resample -ql 2.wav is input file and redhat1 is output file. You should use second one for working with Asterisk
Setup for conference call

Open /etc/asterisk/meetme.conf for editing and on end of file add next:

conf => 100, 8300 100 is a password that asterisk server will ask from you if you want to participate in conference call