asterisk software package provides Open Source Private Branch Exchange (PBX), you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install asterisk
asterisk is installed in your system.
Make ensure the asterisk package were installed using the commands given below,
$ sudo dpkg-query -l | grep asterisk *
You will get with asterisk package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Communication Programs |
| Package | asterisk |
| Version | 1:13.1.0~dfsg-1.1ubuntu4 |
| Description | Open Source Private Branch Exchange (PBX) |
| Sub Section | comm |