Envoy ACP/XF Application Programming Manual

EnvoyACP/XF and the Application Task
EnvoyACP/XF Application Programming Manual–132179
1-19
Your Application and V.25 bis
Figure 1-5 shows how the V.25 bis commands and indications are used during an
incoming call.
Figure 1-4. Outgoing Call V.25 bis
Figure 1-5. Incoming Call V.25 bis
050
DTE
ServerNet
WAN
Concentrator
DCE
V.25 bis
Modem
CRNnnnn
(dialing the number)
either INV and CFI
(invalid command and call failure)
or
VAL and CFI
(valid command but call cannot be
connected)*
*Termination sequences are vendor dependent
051
DTE
ServerNet
WAN
Concentrator
DCE
V.25 bis
Modem
INC (incoming call)
either CIC
(connect incoming call)
or
DIC
(disregard incoming call)
either INV
(invalid command
received)
or
VAL
(valid command received)