Installation guide

4-15
Configuration
Optional Facilities
Optional facilities are those which may or may not be offered by the network provider and to
which customers choose whether or not to subscribe. The facilities implemented on
HiSpeed WAN Comm. adapters refer to these main concerns:
– incoming and outgoing data accesses, in general or according to the membership of a
Closed User Group,
– redirection and retransmission of data,
– charging of communications.
Some facilities are valid for all calls whereas other ones must be specifically requested for
the duration of the call. In this case, a facility request is inserted in the call packets, either in
call-request packet or in call-accepted packet, such as described in the figure 36.
Calling
DTE
Called
DTE
DCE
X.25
Network
Call Request
Call Connected
Call Accepted
Incoming Call
Facility Request
Facility RequestFacility Indication
Facility Indication
Figure 36. Facilities and Call Packets
The facilities and their coding are described in the X.25 CCITT recommendation.
Outgoing call acceptance (CUG) [enable]
Acceptance of outgoing calls from a user to users who do not belong to the same Closed
User Group.
Two possible values:
enable
disable If there is any such outgoing call, it is cleared immediately, returning a
clear-indication packet to the user
Incoming call acceptance (CUG) [enable]
Acceptance by a user of incoming calls from users who do not belong to the same Closed
User Group
Two possible values:
enable
disable If there is any such incoming call, it is cleared immediately
Network user identification [enable]
Possibility for a user to give to the network, in a call or data packet, information about
charging, security or network management.
Two possible values:
enable
disable