Something
public text v1 · immutable#!/bin/sh
set +o histexpand
TYPE='SIP|IAX2'
HOST='linux.org'
echo -n "Enter Your Number : "
read NUM
echo -e "Converted Number : "
for((i=${#NUM}-1;i>=0;i--))
do
echo -n ${NUM:i:1}
((i!=0))&&echo -n .
done
echo -e "\nData Section : 1 1 '"u"' '"E2U+SIP"' '"!^\\\\+14193017228sip:14193017228@linux.org!"' ."