iPECS UCP - 2.38.3 SMDI (Simplified Message Desk Interface) AA;VM Signaling

iPECS UCP
Feature Description and Operation Manual Issue 1.3
113
2.38.3 SMDI (Simplified Message Desk Interface) AA/VM Signaling
Description
The system may employ SMDI (Simplified Message Desk Interface) protocol to communicate
with an adjunct AA/VM system. When a call is routed to an AA/VM SLT port, the system will
send SMDI messages over the assigned SMDI RS-232 port, informing the AA/VM of the
characteristics of the call.
There are three types of SMDI messages. Within each message is an “Action Code”, which
defines the function or required action of the AA/VM system. Fields within the messages also
define the called/calling station and station status. The various message types and definition
of the fields are shown in the chart below.
SMDI Protocol
Type I message
cr lf MD ggg mmmm a xxxxxxxxx sp yyyyyyyyy sp cr lf^Y
Type II message
cr lf MD ggg mmmm a xxxxxxxxx sp sp cr lf^Y
Type III message
cr lf MD ggg mmmm a sp yyyyyyyyy sp cr lf^Y
Field
cr
Description
carriage return
lf
line feed
MD
Message Desk
ggg
Message desk number, AA/VM system, default 001
mmmm
Message Desk terminal, 0001-9999, VM port
a
action code
xxx...x
called station number or station calling the VM group
yy…y
calling station number
sp
ASCII space character
^Y
end of SMDI message, control + Y (0x19)
The following table provides detailed information on the meaning and function of the various
SMDI action codes.
Table SMDI Messages
Action
Code
Reason Purpose
Message
Type
SMDI Message
MD 001 0001-
A Unconditional forward to VM Put Mail II A xxxxx yyyyy
B Called Station busy
Busy Mail
II
B xxxxx yyyyy
C Disconnect, connected party disconnect II C xxxxx yyyyy
D Direct Fwd to VM group
Get Mail
II
D xxxxx yyyyy
E Error, invalid number Error II E xxxxx yyyyy
H Two-way Record record II H xxxxx yyyyy