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ISDN Software Reference for Linux and Windows
442
When a Supplemental Service is invoked, the network may return a NOTIFY
Message to the user. This message can be retrieved using the cc_GetCallInfo( )
function.
The Notify Message (as defined in ETS 300-196-1) is composed of the following
elements:
• Protocol discriminator
• Call reference
• Message type
• Notification Indicator
The Notify message is coded as follows:
87654321
x x x x x x x x
Protocol discriminator
xxxxxxxx
Call reference
x x x x x x x x
Message Type
00100111
Notification Indicator Information element identifier
0 0 0 0 1 0 0 1
Length of Notification Indicator contents
1/1xxxxxxx
ext. Notification Description
0 x x x x x x x
ext. Notification Description
10100001
Notification Data Structure
Coding requirements for other supported Supplemental Services are listed in
Table 60.