Software
Analog Telephony Laboratory Software Environment
Software
The Analog Telephony Laboratory uses a Linux-based PBX environment to generate and manage the telephone services used throughout the laboratory.
The software platform integrates the PBX management interface, telephony engine, analog hardware interface, and SIP/VoIP services required to support the learning environment.
Software Environment
The implementation includes:
- Linux operating system
- Asterisk telephony engine
- FreePBX management interface
- DAHDI hardware interface
- SIP/VoIP services
Together, these components allow the laboratory server to manage both analog extensions and IP-based endpoints.
FreePBX
FreePBX provides the web-based administration interface used to configure and manage the laboratory PBX.
Through FreePBX, the instructor can manage extensions, telephony hardware, internal dialing, and other PBX functions without requiring students to interact directly with the underlying server configuration.
Asterisk
Asterisk provides the telephony engine responsible for call processing within the laboratory.
It manages the communication between analog extensions connected through the FXS hardware and SIP/VoIP endpoints connected through the laboratory network.
DAHDI Interface
DAHDI provides the software interface between Asterisk and the Digium analog telephony hardware.
In the implemented laboratory, the DAHDI configuration exposes the physical FXS ports as analog telephone channels that can be assigned to individual extensions.
Analog Extensions
The laboratory analog extensions are associated with physical FXS channels.
Each configured extension corresponds to a physical analog telephone circuit distributed through the laboratory telecommunications infrastructure.
This allows the PBX to provide the telephone service used by students during installation and testing activities.
SIP / VoIP Extensions
SIP extensions are also configured within the PBX environment.
Preconfigured SIP/VoIP phones can be used as functional endpoints, allowing calls between IP phones and student-installed analog telephone circuits.
This provides a practical method for verifying that the completed analog installation is operational.
FreePBX Configuration
Detailed screenshots and implementation information for the laboratory PBX are available here:
Replication Considerations
The laboratory does not depend exclusively on the specific software versions used in the implemented system.
Equivalent Linux-based PBX platforms may be used provided that they can support:
- Analog FXS interfaces
- Internal extension management
- Analog-to-analog calling
- SIP/VoIP endpoints
- Integration between analog and IP telephony
The software environment therefore represents one practical implementation rather than a mandatory platform specification.