asterisk-core-sounds-en-gsm software package provides asterisk PBX sound files - en-us/gsm, 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-core-sounds-en-gsm
asterisk-core-sounds-en-gsm is installed in your system.
Make ensure the asterisk-core-sounds-en-gsm package were installed using the commands given below,
$ sudo dpkg-query -l | grep asterisk-core-sounds-en-gsm *
You will get with asterisk-core-sounds-en-gsm package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Communication Programs |
| Package | asterisk-core-sounds-en-gsm |
| Version | 1.4.22-1 |
| Description | asterisk PBX sound files - en-us/gsm |
| Sub Section | comm |