dahdi-linux software package provides DAHDI telephony interface - Linux userspace parts, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install dahdi-linux
dahdi-linux is installed in your system.
Make ensure the dahdi-linux package were installed using the commands given below,
$ sudo dpkg-query -l | grep dahdi-linux *
You will get with dahdi-linux package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Communication Programs |
| Package | dahdi-linux |
| Version | 1:2.6.1+dfsg2-1 |
| Description | DAHDI telephony interface - Linux userspace parts |
| Sub Section | comm |