Asterisk: round-robin dial out through trunks

March 27th, 2014

Imagine that we have 3 trunks for dial out and we must balance outgoing calls in random order. This could be done with the RAND function. Module func_rand.so must be compiled and loaded.

sip.conf:

[trunk1](trunk_preset)
host=10.10.10.11

[trunk2](trunk_preset)
host=10.10.10.12

[trunk3](trunk_preset)
host=10.10.10.13

extensions.conf:

exten => _79XXXXXXXXX,1,NoCDR()
    same => n,Dial(SIP/trunk${RAND(1,3)}/${EXTEN})
    same => n(hang),Hangup()

You may say – well, OK, but what if my trunks are named not like [trunk1], [trunk2], [trunkN] and I can not substitute the last symbol in Dial application?
In this case we can write a list of trunk names (which you configured already in sip.conf) in txt file, for example rrtrunks.txt:

teliasonera-out
deutschetelekom-out
level3-out

Ensure that a ‘sort’ command is available in your *NIX system. Usually it’s a part of coreutils. Older versions don’t suit us, because they don’t have the ‘-R’ flag which means sort randomly. Newer versions have.

Then load func_shell.so and use it in your dialplan. It can execute a shell command and use its output in dialplan.

exten => _79XXXXXXXXX,1,NoCDR()
    same => n,Dial(SIP/${SHELL(sort -R /etc/asterisk/rrtrunks.txt | head -1)}/${EXTEN},20)
    same => n,Hangup()

It means that we sort randomly our list of trunks and get the first one each time.

Tags: , , , , , , , ,
Posted in Uncategorized | Comments Closed

Get rid of LibreOffice slow start

March 26th, 2014

Assuming your hostname is darkstar, add these lines to your /etc/hosts:

# fix libreoffice slow start
127.0.0.1 darkstar.(none)

Be sure that your hostname is the same both in /etc/hostname and in /etc/hosts .

Thanks for www.nixp.ru.

Tags: , ,
Posted in Uncategorized | Comments Closed

Asterisk 12 Notes

March 24th, 2014

To use ‘Gosub‘ (and also ‘Return‘, ‘GosubIf‘ and ‘StackPop‘) application you must load app_stack.so .
To make calling between endpoints possible, you must load bridge_simple.so .

To originate calls from CLI you must load res_clioriginate.so (assuming app_originate.so is already loaded).

Tags: ,
Posted in Uncategorized | Comments Closed

Using ‘screen’ for multiple SSH sessions from a remote computer

March 23rd, 2014

1. Log in to the remote server.
2. Type 'screen'. The virtual screen #0 will be opened. We’ll use it as a starting point for creating other screens.
3. Type 'screen -t server1'. This command will open one more virtual screen with title ‘server1’, we will use it for entering the server1, for example ‘ssh server1’.
4. Press Control-a and then ” (double inverted commas)
This command will list all your virtual screens. You may select any of them moving with up/down arrows and then pressing enter. Enter the screen #0.
5. From screen #0 we can create one more screen, for example 'screen -t server2'.
6. Jumping from one screen to some other can be done with Ctrl-a and then ” or Ctrl-a and the number of screen. In our case – 0, 1 and 2.
7. You may close any screen with Ctrl-D or 'exit', like usual.

Another scenario:

1. screen -S 1st_session_name to start screen with some session name.
2. Ctrl-a d to detach from session.
3. screen -ls to list all sessions and their pids.
4. screen -r %pid% to reconnect to a session with %pid%.

Tags: , ,
Posted in Uncategorized | Comments Closed

find

March 6th, 2014

Find files older than 15 days and list them:

[root@staff /root]# find /var/squid/logs/ -mtime +15 -execdir ls -lh {} \;
-rw-r-----  1 squid  squid    91k Feb 16 20:46 /var/squid/logs/cache.log.17
-rw-r-----  1 squid  squid   108M Feb 17 00:00 /var/squid/logs/access.log.17
-rw-r-----  1 squid  squid   122M Feb 16 00:00 /var/squid/logs/access.log.18
-rw-r-----  1 squid  squid   355M Feb 19 00:00 /var/squid/logs/access.log.15
-rw-r-----  1 squid  squid   137k Feb 18 23:55 /var/squid/logs/cache.log.15
-rw-r-----  1 squid  squid   275M Feb 18 00:00 /var/squid/logs/access.log.16
-rw-r-----  1 squid  squid   145k Feb 17 21:49 /var/squid/logs/cache.log.16

List files modified during last 5 minutes:

find /some/path/ -type f -mmin -5 -execdir ls -l {} \;

Find files bigger than 2 kilobytes in .mc/ directory:

find .mc/ -type f -size +2000c
.mc/ini

or:

find .mc/ -type f -size +2k
.mc/ini

Find files smaller than 80 bytes in .mc/ directory:

vn ~ # find .mc/ -type f -size -80c
.mc/Tree
.mc/cedit/cooledit.clip

Handy one-liner for searching a file with wildcard, case-insensitive, in 2 directories simultaneously (assuming the file contains ‘Yutong’):

srv ~ # find /storage/sounds/{cars,ru/cars} -iname yut\*
/storage/sounds/cars/Yutong.wav
/storage/sounds/ru/cars/Yutong.wav

Find files with “+380” in their name which were created on October 13, 2015 and copy them to /home/lexus/:

find /storage/cluster/ready/ -name "*+380*" -type f -newermt 2015-10-13 ! -newermt 2015-10-14 -execdir cp {} /home/lexus/ \;

Tags:
Posted in Uncategorized | Comments Closed

WordPress: disabling quotes convertion

February 16th, 2014

You have to edit the file default-filters.php which is located here:
/your_WP_root_directory/wp-includes/default-filters.php

Comment out the line:
add_filter( 'the_content', 'wptexturize' );

Based on this topic: https://wordpress.org/support/topic/please-give-us-the-option-to-turn-of-smart-quotes .

Tags: , , ,
Posted in Uncategorized | Comments Closed

awk

February 16th, 2014

Print the first line:
cat somefile.txt | awk ‘{print $1}’

… and see the number of active calls on Asterisk PBX:

asterisk -rx 'core show calls' | head -n 1 | awk '{print $1}'

Print all but first 6 columns of the file:
cat somefile.txt | awk ‘{$1=$2=$3=$4=$5=$6=””; print $0}’

… and see who’s trying to connect to 5060/TCP and 22/TCP (some fields reduced):

root@vds:~# tail -n 2 /var/log/syslog | awk '{$1=$2=$3=$4=$5=$6=""; print $0}'
      iptables denied Asterisk IN=eth0 SRC=69.60.119.204 DST=XX.XX.YY.ZZ PROTO=UDP SPT=5072 DPT=5060
      iptables denied SSH IN=eth0 SRC=222.186.62.39 DST=XX.XX.YY.ZZ PROTO=TCP SPT=6000 DPT=22

By default, awk doesn’t separate columns. To do that, use comma:

root@vds:~# grep Aster /var/log/syslog | awk '{print $1,$2,$3,$9,$13}'
Feb 17 07:03:25 Asterisk SRC=74.118.193.77
Feb 17 07:13:23 Asterisk SRC=85.25.194.185
Feb 17 07:56:31 Asterisk SRC=188.138.34.254
Feb 17 08:12:02 Asterisk SRC=200.12.49.147

PS: all these IPs are bad guys. They’re trying to connect to my SSH and SIP ports. So, I do not hide their addresses :)

Update:

In case you’ve got an output like

“123456”
“234567”
“345678”

and want to get rid of first and last symbols:

rev input_file.txt | cut -c2- | rev | cut -c2-

In case your columns have some other delimiters than space, p.e. comma, specify it:

cat file.txt | awk -F',' '{print $3}'

Tags:
Posted in Uncategorized | Comments Closed

Debian/Ubuntu: set default applications (both X11 and console)

February 7th, 2014

To set the default web browser type:

sudo update-alternatives --config x-www-browser

This will lead to:

lexus@lexus:~$ sudo update-alternatives --config x-www-browser
There are 3 choices for the alternative x-www-browser (providing /usr/bin/x-www-browser).

  Selection    Path                    Priority   Status
------------------------------------------------------------
  0            /usr/bin/google-chrome   200       auto mode
* 1            /usr/bin/firefox         40        manual mode
  2            /usr/bin/google-chrome   200       manual mode
  3            /usr/bin/opera           200       manual mode

Press enter to keep the current choice[*], or type selection number:

To set default editor:

update-alternatives --config editor

To edit (or leave with defaults) all variants, use:

sudo update-alternatives --all

Tags: , , , , ,
Posted in Uncategorized | Comments Closed

Asterisk: block inbound call by CALLERID(num) (AEL syntax)

January 31st, 2014

One number :

    73522123456 =>
    {
        if(${CALLERID(num)} = 74995008119)
            {
            Hangup;
            }
        Dial(IAX2/iaxpeer/somedevice);
    }

Several numbers:

    73522123456 =>
    {
    switch (${CALLERID(num)}) {

         case 74957805170:
            NoOp(Block call from Susan);
            Hangup();
            break;

        pattern [78]4957805174:
            NoOp(Block call from Anna);
            Hangup();
            break;

        pattern [78]4957805061:
            NoOp(Block call from Lily );
            Hangup();
            break;

        pattern [78]495780508X:
            NoOp(Block call from Samantha);
            Hangup();
            break;

        default:
            Set(CDR(accountcode)=some-accountcode);
            Dial(SIP/somepeer/tomsphone01,,r);
        }
    }

pattern – here you may use constructions like [167] and/or 123X.
case – is exact sequence of symbols.

https://wiki.asterisk.org/wiki/display/AST/AEL+Conditionals

Tags: , , , ,
Posted in Uncategorized | Comments Closed

FreeSWITCH installation

January 17th, 2014

Download latest stable release (January, 2014) http://files.freeswitch.org/freeswitch-1.2.17.tar.bz2 to /usr/src/.
I have the basic Debian 7.3 Wheezy installation.
I needed these dependences: apt-get install zlib zlib-dev zlib1g-dev libjpeg62 libjpeg62-dev libjpeg8-dev libcurses-perl libncurses5-dev libssl-dev

Then:

./configure

make install
make cd-sounds-ru-install
make cd-moh-ru-install
make cd-moh-install

Symlinks:
ln -s /usr/local/freeswitch/bin/fs_cli /usr/local/bin/fs_cli
ln -s /usr/local/freeswitch/bin/freeswitch /usr/local/bin/freeswitch

Fire!:
fs_cli -l 5

Tags: ,
Posted in Uncategorized | Comments Closed

« Older Entries
Newer Entries »