Page 2-55
10/2008
AMT/PTD/TR/0020/2/7/EN
2.6
Functional description of M90x, M910 and M92x mobile
terminals
A NeXspan or Aastra X series PBX manages terminal mobility with the following functions:
Authentication
Mobile authorization procedure. The decision to initiate the procedure is controlled by the PBX.
Each mobile has:
•
an authentication code (AC) programmed on the mobile by the user and calculated by the
PBX. It is only used for the initial authentication.
•
a user authentication key (UAK) which is generated automatically. It is used for all
subsequent authentications.
Authentication is performed by a specific DECT algorithm (DSAA).
The authentication procedure is activated in the following cases:
•
when the mobile registers,
•
after receiving n successive calls (n is a system parameter, default value: 10).
Access right
In the case of a single site limited to 32 cells, with no company / department restrictions, the
PARI loaded in each base station is used for right of access. The PARK loaded onto each set is
the same as the PARI (y=32). To avoid locking onto a base station on which it is not authorised,
the mobile possesses the PARK{y} information item, containing the first y significant bits of the
ARI (PARI or SARI) used to encode the right of access. This information is loaded onto a
cordless handset at the time of its registration.
When a mobile roaming request is made, the mobile receives the LAL which allows it to
determine whether a roaming change declaration is necessary during reception of a new base
station.
Mobile identification
Each mobile has an IPEI (terminal serial number) and an IPUI. The IPEI comprises the EMC (16
bits) and the PSN (20 bits). The IPUI contains 2 fields - PUT and PUN. The PUT defines the user
type. Normally, type "O" is entered for this field. The PUN is the directory number of the set
coded in BCD, with "F" added to the left of the digit string. It is entered in the mobile when the
latter registers.
Subscription
Subscription is the registration of a mobile’s call processing features.
Summary of Contents for X Series
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