Nera F33 User Manual page 49

USER GUIDE USER MANUAL
Net service provider
The Net service provider issues your user licence
and IMN (Inmarsat Mobile Number) phone numbers.
It is also responsible for the billing of calls (charges).
The Nera F33 may respond to individual IMN num-
bers, giving the possibility to transfer a call directly to
each device attached to it.
Note! TermlD is a term that includes both Originating
Identity (OlD) and Destination Identity (DID).
The DID is used from LES to MES to identify the
service, whereas OlD is used from MES to LES to
identify the service.TermlD is used in this manual
because the DID and OlD have the same value.
Nera F33
SYSTEM DESCRIPTION
Calls from Mobiles
See figure.
To make an outgoing call, you use a standard inter-
national telephone number with the 00 prefix. The
MES automatically includes information to identify
itself and the particular device that originates.
System signalling
The LES uses the identifying information of the
attached device for billing purposes.
The MES transmits the dialing information on a
channel specially assigned by the NCS to the LES.
LES routes the call over the public telecommunica-
tions networks to the intended destination. When the
called party responds, the call proceeds.
Call announcement from mobile to fixed:
The MES uses the Return Identity (RTNID) to com-
municate with the LES. It uses the TermlD to identify
its IMN number and the service in use.
The attached equipment dials the number and
transmits its MSN number to the MES. The MES
routes the MSN to a TermlD.
LES checks that the RTNID is commissioned before
connecting the call to the fixed net.
'
CONT D
49