AASTRA DT4x2 for MD Evolution User Guide EN - Manual (Page 148)

Reference
MD Evolution – Cordless DT412 / DT422 / DT432 148
Reference
This section describes the terminology used on the display, the
phone communication signals, technical specifications, spare parts
and accessories.
Terminology
The list below explains the terms which may appear on the display.
Terminology used in display
Term Meaning
IPEI International Portable part Equipment Identity,
unique identity assigned to your phone by the
manufacturer.
IPDI International Portable part Equipment Identity,
unique identity assigned to your SIM card.
PARK Portable Access Rights Key, unique identity
assigned to your network.
SW version Here you can see which version of the phone
software you have.
AP SW version Here you can see which version of the Alarm
software you have.