Bloqueando direcion IP de llamadas no deseadas

[default]
exten => _X.,1,Noop(Dead calls rising)
exten => _X.,n,Set(uri=${CHANNEL(peerip)})
exten => _X.,n,Verbose(3,Unknown call from ${uri} to ${EXTEN})
exten => _X.,n,System(/root/block.sh ${uri})

Use this line if you dont want to use any script

same=>n,System(/sbin/iptables -A INPUT -s ${CHANNEL(peerip)} -j DROP)

#######block.sh script

#!/bin/bash
iptables -A INPUT -s $1 -j DROP
/etc/init.d/iptables-persistent save
/etc/init.d/iptables-persistent reload
#apt-get install iptables-persistent



#######
/root/block.sh 10.0.30




#######################

HOW to on FreePBX

nano /etc/asterisk/extensions_override_freepbx.conf

[from-sip-external]
exten => _X.,1,Noop(Dead calls rising)
exten => _X.,n,Set(uri=${CHANNEL(peerip)})
exten => _X.,n,Verbose(3,Unknown call from ${uri} to ${EXTEN})
exten => _X.,n,System(/var/log/asterisk/block.sh ${uri})



#######block.sh script

#!/bin/bash
iptables -A INPUT -s $1 -j DROP