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FAX-L1000 Chapter 5: Appendix
Example) G4/G3 Fallback function and operation procedure
• In the case where the FAX-L1000 makes on outgoing G4 call to a G3 machine
a) After the FAX-L1000 sends the SETUP message which includes the Bearer Capability
information element “unrestricted digital.” notification of a DISC message containing
Cause number “88” is made from the network, and a D-channel connection error occurs.
Cause number “88” means “Incompatible Destination.” and the FAX-L1000 displays the
service error code “##1088.” The “cause number” is set to the clearing message first
notified by the network (DISC message, REL message, or RELCOMP message).
Figure 5-56 G4
//
//
/ G3 Fallback Procedure (1)
Display the service error code "##1088"
D-channel error
CALL PROC
SETUP (BC: "Unrestricted digital")
ISDN
Dch Layer 3 Protocol
REL
DISC (Cause number: "88")
REL COMP
G3 machine
FAX-L1000