By default, astercc providers you 5 free simultaneous channels license, you can purchase more if need.
First, edit /opt/asterisk/scripts/astercc/astercc.conf which is in same folder with astercc daemons, go to section [licence], you can find three parameters there
[licence]
licenceto =
key = （no this parameter in current version now)
channel = 5
change “channel” to the number [...]