[root@sip service]# cat /etc/asterisk/zapata.conf [channels] signalling=pri_cpe switchtype=euroisdn echocancel=yes ; You can set this to 32, 64, or 128, tweak to your needs. echocancelwhenbridged=yes echotraining=400 ; Asteris the beginning of the call, number is in milliseconds callerid=asreceived group=1 context=default ; Points to the default context of your extensions.conf channel => 1-15,17-31 amaflags=billing [root@sip service]# cat /etc/zaptel.conf | grep -v '#' span=1,1,1,CCS,HDB3,crc4 loadzone=za defaultzone=za bchan=1-15,17-31 dchan=16 [Mar 13 15:35:33] WARNING[11218]: chan_zap.c:11067 process_zap: Ignoring signalling [Mar 13 15:35:33] WARNING[11218]: chan_zap.c:11067 process_zap: Ignoring switchtype [Mar 13 15:35:33] ERROR[11218]: chan_zap.c:10426 build_channels: Unable to reconfigure channel '1-15,17-31' [Mar 13 15:35:33] WARNING[11218]: chan_zap.c:11369 reload: Reload of chan_zap.so is unsuccessful! sip*CLI>