Welltech Dialogic SS7 Protocols ISUP - Manual (Page 66)

Section 6 Interface to Application
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Additional call information
This primitive is used by ISUP to indicate additional call information (other
than called address digits) during incoming call set-up.
Message type
INF (Information Message)
Mandatory parameters
• Information indicators
Optional parameters
• Access transport
• Calling party category
• Calling party number
• Call reference
The following optional parameters are supported in ITU mode only:
• Parameter compatibility information
• Network specific facility
The following optional parameters are supported in ANSI mode only:
• Business group
• Charge number
• Originating line information
• Redirecting number
• Redirection information
• User to user information
6.6.16 Loop Back Acknowledgement Indication
Loop back acknowledgement indication
This primitive is used by ISUP to indicate to the application that a continuity
check loop has been applied to the circuit. When an LPA message is received
from the network by the ISUP module, this primitive will be sent to the
application.
Message type
LPA (Loop Back Acknowledgement Message)