The Guru Of Tech Gobind

Asterisk Application ‘System()’ in h extension to

create callfile which will handle your callback.

You can also try for ‘Originate()’ application.

Example:

[Main]

exten => 111,1,Goto(cb,1,1)

exten => 222,1,Dial(SIP/666666)

[cb]

exten => 1,1,NoOp(Incoming call from # ${CALLERID(num)})

exten => 1,n,Goto(callback,333,1)

[callback]

;prepare for callback

exten => 333,1,NoOp(Hangup then callback to cellphone)

exten => 333,2,Hangup

exten => h,1,NoOp(copy callback.call file to /var/spool/asterisk/outgoing)

exten => h,n,System(echo -e "Channel: SIP/${CALLERID(num)}\\nContext: Main\\nExtension: 222" > /tmp/${UNIQUEID}.call)

exten => h,n,System(/bin/sleep 10s)

exten => h,n,System(mv /tmp/${UNIQUEID}.call /var/spool/asterisk/outgoing/)

OR

exten => 1,1,Wait(2)

exten => 1,n,Set(CID=${CALLERID(num)})

exten => 1,n,NoOp(Call from ${CID})

exten => 1,n,Hangup

exten => h,n,Originate(SIP/1001,app,Dial,SIP/1002)

Auto Callback to the ANI when ANI answers by the user, we Dial another Call and Bridge them

[Main]

exten => 111,1,Goto(cb,1,1)

exten => 222,1,Dial(SIP/666666)

[cb]

exten => 1,1,NoOp(Incoming call from # ${CALLERID(num)})

exten => 1,n,Goto(callback,333,1)

[callback]

;prepare for callback

exten => 333,1,NoOp(Hangup then callback to cellphone)

exten => 333,2,Hangup

exten => h,1,NoOp(copy callback.call file to /var/spool/asterisk/outgoing)

exten => h,n,System(echo -e "Channel: SIP/${CALLERID(num)}\\nContext: Main\\nExtension: 222" > /tmp/${UNIQUEID}.call)

exten => h,n,System(/bin/sleep 10s)

exten => h,n,System(mv /tmp/${UNIQUEID}.call /var/spool/asterisk/outgoing/)

[Alarm-Algo]

exten => _*99*XXXXXXXXXXXX,1,Answer()

exten => _*99*XXXXXXXXXXXX,n,Set(year=${EXTEN:4:4})

exten => _*99*XXXXXXXXXXXX,n,Set(month=${EXTEN:8:2})

exten => _*99*XXXXXXXXXXXX,n,Set(day=${EXTEN:10:2})

exten => _*99*XXXXXXXXXXXX,n,Set(hours=${EXTEN:12:2})

exten => _*99*XXXXXXXXXXXX,n,Set(minutes=${EXTEN:14:2})

exten => _*99*XXXXXXXXXXXX,n,NoOp(Wake-up call scheduled for ${CALLERID(num)} at ${hours}:${minutes} on ${day}.${month}.${year}.)

exten => _*99*XXXXXXXXXXXX,n,System(echo -e "Channel: SIP/${CALLERID(num)}\\nContext: Alarm\\nExtension: 222" > /tmp/${UNIQUEID}.call)

exten => _*99*XXXXXXXXXXXX,n,System(touch -t ${year}${month}${day}${hours}${minutes} /tmp/${UNIQUEID}.call)

exten => _*99*XXXXXXXXXXXX,n,System(mv /tmp/${UNIQUEID}.call /var/spool/asterisk/outgoing/)

exten => _*99*XXXXXXXXXXXX,n,Playback(rqsted-wakeup-for)

exten => _*99*XXXXXXXXXXXX,n,SayNumber(${hours})

exten => _*99*XXXXXXXXXXXX,n,SayNumber(${minutes})

exten => _*99*XXXXXXXXXXXX,n,Hangup()

[Alarm]

exten => 222,1,Answer()

exten => 222,n,Wait(1)

exten => 222,n,Playback(this-is-your-wakeup-call)

exten => 222,n,Wait(1)

exten => 222,n,Hangup()

I have prepared a module that will show the CPU utilization, current processes, memory utilization and disk quota of a remote system when asked on a PHP page

Below is the syntax and code in PHP and HTML just copy and paste it on the desired directory.

</tr>

<td>Uptime:</td>

</tr>

</tr>

<td>System Information:</td>

</tr>

</tr>

<td>Memory Usage (MB):</td>

</tr>

</tr>

<td>Disk Usage:</td>

</tr>

</tr>

<td>CPU Information:</td>

</tr>

</tr>

</table>

If you are getting this error " Can't create PID PostMasterMailbox, because it's already running" in SYSconfig in OTRS ADMIN

to check the processes type the command on the command prompt

#> ps -ef | grep PostMasterMailbox.pl

then go to mysql and check

mysql> select * from process_id where process_name = 'PostMasterMailbox';

mysql> delete from process_id where process_name = 'PostMasterMailbox';

and lastly run the following command to start the postmaster to fetch the mails

bin/otrs.PostMasterMailbox.pl -f 1

To See type the command

crontab -l -u otrs (--l for list --e for edit)

[root@server ~]# crontab -e -u otrs

# This software comes with ABSOLUTELY NO WARRANTY. For details, see
# the enclosed file COPYING for license information (AGPL). If you
# did not receive this file, see http://www.gnu.org/licenses/agpl.txt.
# --

# check daily the spool directory of OTRS
#10 0 * * * * [ -e /etc/init.d/otrs ] && /etc/init.d/otrs cleanup >> /dev/null; [ -e /etc/rc.d/init.d/otrs ] && /etc/rc.d/init.d/otrs cleanup >> /dev/null
10 0 * * * $HOME/bin/otrs.cleanup >> /dev/null
# --
# cron/postmaster_mailbox - postmaster_mailbox cron of the OTRS
# Copyright (C) 2001-2009 OTRS AG, http://otrs.org/
# --
# $Id: postmaster_mailbox.dist,v 1.3 2009/11/09 15:24:13 mn Exp $
# --
# This software comes with ABSOLUTELY NO WARRANTY. For details, see
# the enclosed file COPYING for license information (AGPL). If you
# did not receive this file, see http://www.gnu.org/licenses/agpl.txt.
# --

# fetch emails every 10 minutes
*/2 * * * * $HOME/bin/otrs.PostMasterMailbox.pl >> /dev/null
# --
# cron/rebuild_ticket_index - rebuild ticket index for OTRS
# Copyright (C) 2001-2009 OTRS AG, http://otrs.org/
# --
# $Id: rebuild_ticket_index.dist,v 1.10 2009/11/09 15:24:13 mn Exp $
# --
# This software comes with ABSOLUTELY NO WARRANTY. For details, see
# the enclosed file COPYING for license information (AGPL). If you
# did not receive this file, see http://www.gnu.org/licenses/agpl.txt.
# --

# just every day
01 01 * * * $HOME/bin/otrs.RebuildTicketIndex.pl >> /dev/null
# --
# cron/session - delete old session ids of the OTRS
# Copyright (C) 2001-2009 OTRS AG, http://otrs.org/
# --
# $Id: session.dist,v 1.12 2009/11/04 12:27:57 mn Exp $
# --
# This software comes with ABSOLUTELY NO WARRANTY. For details, see
# the enclosed file COPYING for license information (AGPL). If you
# did not receive this file, see http://www.gnu.org/licenses/agpl.txt.
# --

# delete every 120 minutes old/idle session ids
55 */2 * * * $HOME/bin/otrs.DeleteSessionIDs.pl --expired >> /dev/null
# --
# cron/unlock - unlock old locked ticket of the OTRS
# Copyright (C) 2001-2009 OTRS AG, http://otrs.org/
# --
# $Id: unlock.dist,v 1.11 2009/11/04 12:27:57 mn Exp $
# --
# This software comes with ABSOLUTELY NO WARRANTY. For details, see
# the enclosed file COPYING for license information (AGPL). If you
# did not receive this file, see http://www.gnu.org/licenses/agpl.txt.
# --

# unlock every hour old locked tickets
*/5 * * * * $HOME/bin/otrs.UnlockTickets.pl --timeout >> /dev/null

To see what crontabs are currently running on your system

#crontab -l

To edit the list of cronjobs

#crontab -e -u root

-e=edit
-u=user
root (root is user)

Cronjobs are written in the following format

* * * * * /bin/execute/this/script.sh

Scheduling explained

As you can see there are 5 stars. The stars represent different date parts in the following order:

1. minute (from 0 to 59)
2. hour (from 0 to 23)
3. day of month (from 1 to 31)
4. month (from 1 to 12)
5. day of week (from 0 to 6) (0=Sunday)

Execute every Friday 1AM

So if we want to schedule the script to run at 1AM every Friday, we would need the following cronjob:

0 1 * * 5 /bin/execute/this/script.sh

The script is now being executed when the system clock hits:

1. minute: 0
2. of hour: 1
3. of day of month: * (every day of month)
4. of month: * (every month)
5. and weekday: 5 (=Friday)

Execute on workdays 1AM

So if we want to schedule the script to Monday till Friday at 1 AM, we would need the following cronjob:

0 1 * * 1-5 /bin/execute/this/script.sh

The script is now being executed when the system clock hits:

1. minute: 0
2. of hour: 1
3. of day of month: * (every day of month)
4. of month: * (every month)
5. and weekday: 1-5 (=Monday til Friday)

Execute 10 past after every hour on the 1st of every month

Here's another one

10 * 1 * * /bin/execute/this/script.sh

Neat scheduling tricks

What if you'd want to run something every 10 minutes? Well you could do this:

0,10,20,30,40,50 * * * * /bin/execute/this/script.sh

But crontab allows you to do this as well:

*/10 * * * * /bin/execute/this/script.sh

Storing the crontab output

By default cron saves the output of /bin/execute/this/script.sh in the user's mailbox (root in this case). But it's prettier if the output is saved in a separate logfile. Here's how:

*/10 * * * * /bin/execute/this/script.sh 2>&1 >> /var/log/script_output.log

Explained

Linux can report on different levels. There's standard output (STDOUT) and standard errors (STDERR). STDOUT is marked 1, STDERR is marked 2. So the following statement tells Linux to store STDERR in STDOUT as well, creating one datastream for messages & errors:

2>&1

Now that we have 1 output stream, we can pour it into a file. Where > will overwrite the file, >> will append to the file. In this case we'd like to to append:

>> /var/log/script_output.log

Type the command

#yum remove perl perl-CPAN

If you just want to block access to all port from an ip 65.55.44.100 then type command :

#iptables -A INPUT -s 65.55.44.100 -j DROP
#service iptables save
#service iptables restart

If you just want to block access to one port from an ip 65.55.44.100 to port 25 then type command:

# iptables -A INPUT -s 65.55.44.100 -p tcp --destination-port 25 -j DROP
#service iptables save
#service iptables restart

Unblock An IP Address:
Use the following syntax (the -d options deletes the rule from table):

# iptables -D INPUT -s 65.55.44.100 -j DROP
# service iptables save
#service iptables restart

Displays generic net statistics of the host you are currently connected to.

#netstat

Shows all connections to the server including the source and destination ips and ports if you have proper permissions.

#netstat -an

Displays routing table for all ips bound to the server.

#netstat -rn

Display the amount of active connections on port 80. Removing the pipe and wc command would display each connection.

#netstat -an |grep :80 |wc -l

Display active Internet connections.

#netstat -natp

Display the Port of ssh

#netstat -lntp | grep ssh

Linux top command interface
The first row shows the same content and the uptime command, [l] can show and hide this area

First Line

top: This is not what it meant, just a name and to01:47:56: current system time

up 1:26: System boot to the elapsed time is now

2 users: currently 2 users online

load average: 0.00,0.00,0.00: System 1 minute, 5 minutes, 15 minutes of CPU load information

Second line:

Tasks: English meaning of work; task; errand.

38 total: well understood, is the current 38 missions, which is 38 processes.

1 running: 1 one process is running

37 sleeping: 37-task sleep

0 stopped: stopped processes

0 zombie: dead processes

Third Line :

Cpu (s): This line shows that the overall CPU Information

0.0% us: the user states the percentage of CPU time the process does not contain renice value is negative, the task of CPU time.

0.7% sy: the percentage of kernel CPU time

0.0% ni: renice value is negative, the task of user-process CPU time percentage. nice is the meaning of the priority

99.3% id: the percentage of idle CPU time

0.0% wa: waiting for I / O, CPU time percentage

0.0% hi: CPU percentage of time the hardware interrupt

0.0% si: CPU percentage of time the soft interrupt

0.0% st: I do not know

Fourth line:

Mem: the meaning of memory

256412k total: total physical memory

30156k used: the amount of physical memory used

226256 free: the amount of free physical memory

8176k buffers: as the amount of physical memory the kernel cache

Fifth Line

Swap: Swap Space

337356k total: total amount of swap

0k used: the amount of used swap

337356k free: the amount of free swap

12160k cached: the total buffer swap

Sixth line:

PID: process ID

USER: Process Owner

PR: process priority, the smaller the priority to be executed

NI : nice Value

VIRT: virtual memory occupied by the process

RES: the amount of physical memory the process

SHR: the process of using shared memory

S: state of the process. S indicates sleep, R for running, Z said rigid state, N is a negative number indicates that the process priority

% CPU: CPU-usage process

% MEM: memory used by the process of physical memory and the percentage of the total

TIME +: The process started after the occupation of the total CPU time that the CPU usage time of the accumulated value.

COMMAND: command name starts the process

================================================== ===========
================================================== ===========
Execute following commands at shell:
___________________________________________
Installing Dependencies {Require Internet}
===========================================

yum -y install autoconf automake libtool gcc-c++ ncurses-devel
yum -y install make expat-devel zlib zlib-devel libjpeg-devel unixODBC-devel
yum -y install openssl-devel gnutls-devel libogg-devel libvorbis-devel
yum -y install curl-devel libtiff-devel libjpeg-devel

___________________________________________
Download/Extract FreeSWITCH Source
===========================================

wget http://files.freeswitch.org/freeswitch-1.0.6.tar.gz
tar -zxvf freeswitch-1.0.6.tar.gz

___________________________________________
Optional {to add OpenZAP support to FreeSWITCH}
===========================================
echo "../../libs/openzap/mod_openzap" >> freeswitch-1.0.6/modules.conf

___________________________________________
Compiling/Installing FreeSWITCH
===========================================

cd freeswitch-1.0.6
./configure
make install
make cd-sounds-install
make cd-moh-install
make uhd-sounds-install
make uhd-moh-install
make hd-sounds-install
make hd-moh-install
make sounds-install
make moh-install
make mod_portaudio-install
make samples

___________________________________________
create symlink for main binaries, EZ-ACCESS
===========================================

#ln -s /usr/local/freeswitch/bin/freeswitch /usr/local/bin/freeswitch
#ln -s /usr/local/freeswitch/bin/fs_cli /usr/local/bin/fs_cli

__________________________________________
Post Installation
===========================================

to launch app
#freeswitch

to launch app at background (no console)
#freeswitch -nc

to stop a running freeswitch instance
[] running foreground: > ... {i.e. 3 periods}
[] running background: # freeswitch -stop

to access cmd-line of any FreeSWITCH server #fs_cli
try commands like 'version','help'
to exit use 'fsctl shutdown' or '...'

Dahdi Channels Configurations

1> cd /etc/asterisk

2> nano dahdi-channels.conf (use nano or vi editor)

To check PRI status

CLI> pri show spans

Get Hardware information about your centos based system

dmidecode

The dmidecode command reads the system DMI table to display hardware and BIOS information of the system. This command will give you information on the current configuration of your system, as well as the system's maximum supported configuration. For example, dmidecode gives both the current RAM on the system and the maximum RAM supported by the system

dmidecode option requires an argument ' -t'

Type number of keyword expected Valid type keywords are:

biod ,system ,baseboard ,chassis ,processor ,memory ,cache,connector ,slot

Example :

To get information about your motherboard, I can use the following command:

#dmidecode -t baseboard

Check How Much RAM system will support

#dmidecode -t memory | grep -i Maximum

List installed perl module

Type

# perldoc perllocal

OR

#instmodsh

Output:

Available commands are:
l - List all installed modules
m - Select a module
q - Quit the program
cmd?

At cmd? prompt type l to list all installed modules:
cmd? l

wget http://asterisk.hosting.lv/bin12/codec_g729-ast12-gcc4-glibc-pentium4.so

cp codec_g729-ast12-gcc4-glibc-pentium4.so /usr/lib/asterisk/modules/codec_g729.so
chmod +x /usr/lib/asterisk/modules/codec_g729.so

stop asterisk (from CLI: stop now)

and restart it by running:
/usr/share/astguiclient/start_asterisk_boot.pl

Check whether the codecs where loaded from asterisk CLI:
> show translation
OR core show transalation

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