I know Asterisk 11 is near its EOL (or maybe passed it by few weeks!), but it's still stable and usable, specially for home server with 5 to 6 expansions like in my case!

I chose version 11 in particular because it's that last version to support Asterisk GUI. I know the gui has been abandoned by Digium, but again it's very stable and usable for small installations like mine.

Here is a tutorial on how to install Asterisk 11 and its GUI on the latest clearOS 7.3.

First, yum update then reboot the server.

Install dependencies:

yum --enablerepo=clearos-centos groupinstall 'Development Tools'

yum install ncurses-devel libxml2-devel sqlite-devel

Download asterisk code and compile:

cd /usr/src

adduser asterisk -m -c "Asterisk User"

wget http://downloads.asterisk.org/pub/telephony/asterisk/asterisk-11-current.tar.gz

tar zxvf asterisk-11-current.tar.gz

cd asterisk-11.25.2/

contrib/scripts/get_mp3_source.sh

./configure --libdir=/usr/lib64 && make menuselect && make && make install && make samples && make config

In Asterisk Module and Build Option Selection, disable: Channel Drivers -> [ ] chan_mgcp for better performance especially in loaded server.

Start asterisk 11 and make sure it's lisning to port 5060 (asterisk 1.8 did not!):

service asterisk start

netstat -plntu | grep asterisk #see port 5060

install Asterisk GUI:

cd /usr/src

svn checkout http://svn.digium.com/svn/asterisk-gui/trunk asterisk-gui

cd asterisk-gui

./configure

make

make install

Edit /etc/asterisk/http.conf and make the following modifications:

[general]

  enabled=yes

  bindaddr=0.0.0.0

  bindport=8088

  prefix=asterisk

  enablestatic=yes

  redirect=/ /asterisk/static/config/index.html

Edit /etc/asterisk/manager.conf and make the following modifications:

[general]

  enabled=yes

  webenabled=yes

  port=5038

  bindaddr=0.0.0.0

[admin] ;<- GUI username instead of [mark]

  secret=admin

read=system,call,log,verbose,agent,user,config,dtmf,reporting,cdr,dialplan

  write=system,call,agent,user,config,command,reporting,originate

Edit /etc/asterisk/asterisk.conf and make the following modifications:

[options]

stdexten = macro ; <- add this line

Compile the GUI and load it:

make checkconfig #make sure no error

asterisk -rvvvvvvvvv

reload

Now, you can visit the GUI and start configuraing your new PBX:
Goto: http://192.168.0.1:8088/asterisk/static/config/index.html then:
1. Add VOIP SIP Truck: spa, 192.168.1.12 (SPA3102 IP in my case)
2. Add Outgoing Calling Rule: viaSPA, _[098]., Use Trunk: spa, Strip: 0
3. Add new Dial Plan: choose all options
4. Add users
5. Add Incoming Calling Rule: _xxxxx (your phone number as entered in SPA page), any Destination

Finally, allow incoming SIP in clearOS firewall.