X25AM Programming Manual

Introduction
X25AM Programming Manual—527201-001
1-11
Call Accepted Packet
Calling Address
X25AM saves the calling address. The application can obtain it with a SETPARAM 1.
If, after accepting a call, the application initiates a call, the called address is the calling
address saved from the incoming call, in effect, a return call. If your application is not
making a return call and is calling elsewhere, then the application sets a new address
with the SETPARAM 1 procedure or restores the configured address value with the
SETMODE 28.
Facilities
The facilities field can be a maximum of 63 (1980 X.25 format) or 109 (1984 X.25
format) bytes long. If it exceeds these maximums, the call is cleared. Unknown or
unsupported facility codes are ignored. For descriptions of supported facilities, see Per
Call Facilities on page 1-16.
Call User Data
For a detailed discussion of this field, see Call User Data (CUD) in Call Setup Packets
on page 1-7.
Call Accepted Packet
A Call Accepted packet is returned by X25AM in response to an Incoming Call packet.
If the network identifier code is PSS or DATEX-P and the line is not configured for
extended format, then the Call Accepted packet ends with the packet type. No address
length or facility length fields are transmitted.
Called and Calling Address
The called and calling address lengths are always zero, with the following exception:
applications using PTP mode 2 can include the calling and called address in the
packet.
Facilities
Applications using PTP mode 2 must specify any optional facilities to be included in the
packet. X25AM can cause packet size, window size, and throughput negotiation
facilities to be included in the packet. If X25AM does not include any facilities, the
facility length field is transmitted with a value of zero. For descriptions of supported
facilities, see Per Call Facilities on page 1-16.
Call User Data
Applications using PTP mode 2 can include the calling and called address in the
packet.