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FAX-L1000 Chapter 5: Appendix
3.6.6 ISDN Protocol Messages
Main messages which are used in the communication protocols of Layer 2 - Layer 3 of the
control channel’s D-channel and Layer 2 - Layer 6 of the information channel’s B-channel are
listed.
a) D-channel messages
Layer 2
Message
Description
Remark
SABME
Set Asynchronous Balanced
The first thing sent when layer 2 is set.
Mode Extended
UA
Unnumbered Acknowledge
A reply message for SABME, DISC.
DISC
Disconnect
Sent when layer 2 is released.
Layer 3 (Continue)
Message
Description
Remark
SETUP
Request for call settings
First sent by the calling party after setting
layer 2 when making call settings. For the
called party, it does not matter whether or
not layer 2 is connected, SETUP will be
done anyway. Then, if layer 2 has not been
connected on the called party, it will be
connected, and following that CONN, etc.
will be sent.
SETUP ACK
SETUP Acknowledge
SETUP confirmation (request for
additional information).
CALL PROC
Call Proceeding
This means that the calling party SETUP
has been received by ISDN. It is an option
message.
CONN
Connect
On the calling party, receives when the
other terminal has responded. On the called
party, sent for accepted SETUP when able
to respond.
CONN ACK
Connect Acknowledge
On the calling party, sent for received
CONN. On the called party, ISDN sent for
the transmitted CONN.
ALERT
Alerting
On the calling party, receives when the
other terminal is in a call. On the called
party, sent when the user is in a call. It is an
option message.
DISC
Disconnect
Sent when layer 3 is disconnected.
Receives when disconnected from ISDN.
Summary of Contents for FAX L1000
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