ATCOM AX4G Quick Start Manual page 15

AX4G Quick Start Guide
2) If users need the GSM and FXO billing simultaneously, please edit the billing parameters like
the following.
[root@centos6 ~]# vi /etc/asterisk/chan_dahdi.conf
answeronpolarityswitch=yes
polarityonanswerdelay= 300
Notice:
If user need the FXO module billing, please apply for your SP(Server Provider) who will enable
the billing signal to FXO module.
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