HS X.25 is a C-based software library that adheres to the ITU-T recommendation X.25. It comes with source code and includes HsDL and HsSock for X.25 over IP apps (XOT).

HS X.25 has built-in compatibility with the HsDL library, which provides a Data Link layer abstraction. The library also links directly to the HsSock module, which is included in the package. HsSock is a Winsock interface component that provides reliable TCP transport services similar to LAPB/LAPD/HDLC.
One of the main benefits of HS X.25 is its flexibility. The software can be used immediately in an X.25 over TCP (XOT) solution, or with traditional LAPB/LAPD by modifying only the HsDL module. The library supports DTE and DCE operations, allowing it to handle multiple layer 2 links and up to 4095 VCs per link. Other features include SVC support, outgoing and incoming calls, a max packet length of 1024, all X.25 timer and counters implemented, interrupt packets supported, statistics, and a trace function.
Overall, HS X.25 is a robust and versatile software library that provides reliable and efficient X.25 implementation for a variety of applications.
Version 1.0: New Release