Welltech Dialogic SS7 Protocols ISUP - Manual (Page 56)

Section 6 Interface to Application
56
6.6.1 Alerting Indication
This primitive is used by ISUP to indicate that the called subscriber's phone is
ringing. The primitive takes the form of an Address Complete message when
it is the first backward message issued by the destination exchange or a Call
Progress message after the first backward message has been issued.
First backward message received
Message type
ACM (Address Complete Message)
Mandatory parameters
• Backward call indicators
Optional parameters
• Access transport
• Cause indicators
• Call reference
• Optional backward call indicators
• Remote operations
• Service activation
• Transmission medium used
• User to user indicators
Indicates that a previously requested supplementary service has been
provided
• User to user information
The following optional parameters are supported in ITU-T mode only:
• Access delivery information
• Application transport
• Call diversion information
• Conference treatment indicators
• Connected number
• Echo control information
• Generic notification indicator
• Network specific facility
• Parameter compatibility information
• Redirection number
The following optional parameters are supported in ITU-T mode only:
• Redirection number restriction indicator