Patch for /etc/asterisk/extensions.conf to add address conflict check

; Configure unique IP address C-O-N-F (2663)
;------------------------------------------
exten => 2663,1,Answer
exten => 2663,2,Playback(enter-ip)
exten => 2663,3,Read(newip||15)
exten => 2663,4,SayDigits(${newip})
exten => 2663,5,System(/bin/echo "${newip}" > /tmp/newip.txt)
exten => 2663,6,System(/bin/setnewip)
exten => 2663,7,Playback(address-conflict)

---------------------------------------------------------------------

New file for /bin/setnewip to add address conflict check

#!/bin/sh -x
# /bin/setnewip
# David Rowe Nov 18 2007
# Modified for Openwrt's uci interface by Elektra
# Sets a new IP based on DTMF digits collected by Asterisk
# Asterisk places its collected IP in /tmp/newip.txt
# Modified to check if IP address is in use. TLG May 21 2011.

if [ ! -f /tmp/newip.txt ]; then
  exit
fi

# convert * seperated IP like 192*168*1*32 to 192.168.1.32
cat /tmp/newip.txt | sed 's/\*/\./g' > /tmp/newip_dot.txt

# Check for address conflict
if ping -c 5 `cat /tmp/newip_dot.txt`; then
   exit
fi

OCTET_A=`uci show network.lan.ipaddr | cut -d = -f2 | cut -d . -f1`
OCTET_B=`uci show network.lan.ipaddr | cut -d = -f2 | cut -d . -f2`
OCTET_C=`uci show network.lan.ipaddr | cut -d = -f2 | cut -d . -f3`

uci set network.lan.ipaddr=`cat /tmp/newip_dot.txt`
uci set network.lan.gateway=$OCTET_A.$OCTET_B.$OCTET_C.1
uci commit network

reboot