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User Facility Support 191
User Facility Support
X.25 Facilities are encoded into the Facility field of the call request packet
without any interpretation on the part of the program. This allows you to specify
any optional User Facilities, except for the packet retransmission Facility and
extended packet sequence numbering (modulo 128).
The Facility field contains both Facility codes and their associated parameters.
The code format varies since some Facilities may have one, two, or more
parameters. Enter the contents of the User Facilities field as hexadecimal
numbers separated by commas, as ASCII characters within either single or
double quotation marks, or as a combination of both.
Facility Types
Facilities fall into two groups: those specified at subscription time, and those
specified on a per-call basis.
Subscription Facilities
The first group includes CCITT Facilities such as nonstandard default window
and packet sizes, Closed User Group definitions, barring of incoming or
outgoing calls, and Reverse Charging.
Per-Call Facilities
The second group of Facilities are agreed upon at the time of subscription but
can be used on a per-call basis. These Facilities include: Reverse Charging,
indexing of a Closed User Group (CUG), or specification of a Network User
Identification (NUI).
Facility Syntax
Facility codes are entered as a string of numbers and/or ASCII characters. The
first parameter of a Facility code indicates the Facility you want to use. The
subsequent parameters supply information about that Facility.
A request for CCITT Facilities must always precede all requests for non-
CCITT Facilities. The National Facility Marker (0,0) need only be included
when at least one request for a non-CCITT facility is present.
The following sections explain the syntax for Network User Identification, and
Flow Control Negotiation.
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