X25AM Programming Manual

Introduction
X25AM Programming Manual—527201-001
1-10
Incoming Call Packet
Using the SETPARAM 41 Procedure Call
Set or alter an X25AM subdevice's CUD values programmatically, using the
SETPARAM 41 procedure call.
The SETPARAM 41 procedure can fetch the call user data that results from any of
these methods. If the SU does not have any call user data, SETPARAM 41 returns a
zero length last parameter.
File-system error 2 (operation not allowed) returns if any of the following conditions
exist:
•
CUD with a hexadecimal string greater than 24 characters (12 bytes of CUD
appended to 4 initial bytes for the protocol id) on an ITI SU.
•
CUD with a hexadecimal string greater than 32 characters (16 bytes of CUD) on a
PTP SU.
•
SETPARAM 8 issued for a subdevice with an existing CUD
•
REMOTENET (also called REMOTEID) of X25UD, DATAPAC, DDX-P, or UNINET
For syntax examples of the SETMODE 28, SETPARAM 8, and SETPARAM 41
procedures, see Appendix A, Procedures Summary for X25AM.
About the SCF ADD and ALTER commands
If the called network (REMOTENET) does not require a port number in the CUD, the
subdevice can be stopped and then the CUD field altered with the SCF ADD and
ALTER commands. If the RESET attribute is specified, the CUD data is deleted and
the value resets to “empty.”
For detailed information about using SCF commands with X25AM, refer to the X25AM
Configuration and Management Manual.
Incoming Call Packet
The network initiates a call with an Incoming Call packet.
Called Address
The called address format depends on the network. The called address can be the
DTE address and the port number, the DTE address only (with a port number from the
fifth byte of call user data), or the port number only.
Note. Communications Management Interface (CMI) commands can be used instead of SCF
commands for D-series RVUs. However, HP recommends using SCF because it provides
additional functionality. For more information about CMI, refer to the Communications
Management Interface (CMI) Operator Reference Manual.