diff --git a/docs/tut_asterisk_installs.rst b/docs/tut_asterisk_installs.rst
index 83b21b600..5dd32ea8d 100644
--- a/docs/tut_asterisk_installs.rst
+++ b/docs/tut_asterisk_installs.rst
@@ -1,33 +1,64 @@
 Software installation
 =====================
 
-We have chosen Debian Jessie as operating system.
+We have chosen Debian 11 (Bullseye) as the operating system.
 
 CGRateS
+-------
+
+*CGRateS* can be installed using the instructions found :ref:`here<installation>`.
+
+Asterisk
 --------
 
-**CGRateS** can be installed using the instructions found :ref:`here<installation>`. 
+To install Asterisk, follow these steps:
 
+1. Install the necessary dependencies:
 
-Asterisk_
----------
+   ::
 
-We got Asterisk14_  installed via following commands:
-::
+      sudo apt-get install build-essential libasound2-dev autoconf openssl libssl-dev libxml2-dev libncurses5-dev uuid-dev sqlite3 libsqlite3-dev pkg-config libedit-dev libjansson-dev
 
- apt-get install autoconf build-essential openssl libssl-dev libsrtp2-dev libxml2-dev libncurses5-dev uuid-dev sqlite3 libsqlite3-dev pkg-config libedit-dev
- cd /tmp
- wget --no-check-certificate https://raw.githubusercontent.com/asterisk/third-party/master/pjproject/2.7.2/pjproject-2.7.2.tar.bz2
- wget --no-check-certificate https://raw.githubusercontent.com/asterisk/third-party/master/jansson/2.11/jansson-2.11.tar.bz2
- wget http://downloads.asterisk.org/pub/telephony/asterisk/asterisk-16-current.tar.gz
- tar xzvf asterisk-16-current.tar.gz
- cd asterisk-16.1.0/
- ./configure --with-jansson-bundled
- make
- make install
- adduser --quiet --system --group --disabled-password --shell /bin/false --gecos "Asterisk" asterisk || true
+2. Download Asterisk:
 
+   Replace `<ASTERISK_VERSION>` with the desired version, e.g., `20-current`.
 
-Once installed we proceed with loading the configuration out of specific tutorial cases bellow.
+   ::
 
-.. _Asterisk14: http://www.asterisk.org/
+      wget https://downloads.asterisk.org/pub/telephony/asterisk/asterisk-<ASTERISK_VERSION>.tar.gz -P /tmp
+
+3. Extract the downloaded archive:
+
+   ::
+
+      sudo tar -xzvf /tmp/asterisk-<ASTERISK_VERSION>.tar.gz -C /usr/src
+
+4. Change the working directory to the extracted Asterisk source:
+
+   Replace `<ASTERISK_MAJOR_VERSION>` with the major version number of the downloaded Asterisk version, e.g., `20`.
+
+   ::
+
+      cd /usr/src/asterisk-<ASTERISK_MAJOR_VERSION>*/
+
+5. Compile and install Asterisk:
+
+   ::
+
+      sudo ./configure --with-jansson-bundled
+      sudo make menuselect.makeopts
+      sudo make
+      sudo make install
+      sudo make samples
+      sudo make config
+      sudo ldconfig
+
+6. Create the Asterisk system user:
+
+   ::
+
+      sudo adduser --quiet --system --group --disabled-password --shell /bin/false --gecos "Asterisk" asterisk
+
+Once installed, we proceed with loading the configuration out of specific tutorial cases below.
+
+.. _Asterisk: http://www.asterisk.org/