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FAX-L260i Chapter 3: Maintenance & Service
Figure 3-18 G4 -> G3 Fallback Procedure (1)
b) Next, the 4 digits “1088” of the service error code “##1088” are registered in
service data #4B ISDN
BASIC G4/G3 Fallback
, and another outgoing call is made to the G4. In this situation, with the first
outgoing call, a) D-channel cannot be connected in the same way, but after receiving the RELCOMP
message from the network, the Bearer Capability information element included in the SETUP message is
changed from “unrestricted digital” to “3.1kHz audio” and the SETUP message is sent again.
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-L260i
G3 machine
CONN ACK
CONN
CALL PROC
SETUP (BC: Unrestricted digital)
ISDN
Dch
Layer
3
Protocol
REL
DISC (Cause number: "88")
SETUP (BC: 3.1kHz audio)
BC:
Bearer Capability
REL COMP
CALL PROC
G4/G3 Fallback
procedure
FAX-L260i
Example) G4/G3 Fallback function and operation procedure
• In the case where the FAX-L260i makes on outgoing G4 call to a G3 machine
a) After the FAX-L260i 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-L260i 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 3-19 G4 -> G3 Fallback Procedure (2)
Содержание Fax-L260i
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