Digi TransPort User Manual page 560

<facilities->
(separated by commas, terminated with a dash)
<address>
<user data>
The facility codes supported are:
F
Q
Gnn
Gnnnn
R
N<NUI>
Example
CALL R,G12,NMYNUI-56512120DHello
places a call to address 56512120 using reverse charging and specifying Closed User Group 12.
The string "MYNUI" is your Network User Identity and the string "Hello" appears in the user data
field of the call packet.
Note
The particular facilities that are available will vary between X.25 service providers.
If a CALL command is issued without the address parameter, it is assumed that you wish to go
back on-line to a previously established call (having used the PAD recall facility to temporarily
return to the PAD> prompt).
Fast select (ISDN B-channel only)
When the standard Fast select facility is requested using the "F" facility code, the call packet
generated by the CALL command is extended to allow the inclusion of up to 124 bytes of user
data. For example:
CALL F-1234567890DThis DATA sent with call packet
would cause an X.25 CALL packet to be sent using the Fast select facility including the message
"This DATA sent with call packet" (the Carriage Return used to enter the command is not
transmitted). Without the inclusion of the Fast select facility code, only the first 12 characters
would be sent.
When a Fast select CALL has been made the PAD accepts an extended format response from the
called address. This response, consisting of up to 124 bytes of user data, may be appended to the
returning call accepted or call clear packet. When one of these packets is received, the user data
is extracted and passed from the PAD to the terminal immediately prior to the "CLR DTE . . ."
message in the case of a call clear packet or "CON COM" message in case of a call accepted
packet.
When a restricted response Fast select call has been made using the Q facility code, the call
packet indicates that a full connection is not required so that any response to the user data in the
CALL packet should be returned in a call clear packet.
When the PAD receives an incoming call specifying Fast select, the call is indicated to the terminal
in the normal way. For example:
Digi TransPort User Guide
is an optional list of codes indicating the facilities to be requested in the call
is the destination network address.
is any optional user data to be included with the call.
Fast select - no restriction
Fast select - restricted response
Closed User Group
Extended Closed User Group
Reverse charging
Network User Identity code (NUI)
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