Common ISDN Problems
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information elements. Tables 8.4, 8.5, and 8.6 provide summaries for the
messages and their meaning.
Again, all of this information is provided by the debug isdn q931 com-
mand. A sample output is provided later in the chapter. The easiest way to
keep track of the different calls is with the call reference number indicated in
the output of the debug command. This way you will be able to follow the
same call all the way through the process.
T A B L E 8 . 4
Call Reference Flag Definitions
Field Value
Definition
0
From call originator
1
To call originator
T A B L E 8 . 5
q.931 Message Types
Field Value
Definition
0x05
Setup
0x45
Disconnect
0x7d
Status
T A B L E 8 . 6
q.931 Information Elements
Field Value
Definition
0x04
Bearer capability
0x2c
Keypad facility
0x6c
Calling party number
0x70
Called party number
0x3a
SPID
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