Siemens Hipath 3800 — Programming Manual

This is the primary starting point. It covers:

However, if you are maintaining a legacy HiPath 3800, the programming manual is still your lifeline. Many enterprises use the HiPath 3800 as a "gateway" to SIP trunks, preserving their investment in OptiPoint handsets while connecting to a modern UCaaS provider. siemens hipath 3800 programming manual

The factory default for the HiPath 3000 manager is 31994 . System Administration and Programming This is the primary starting point