Welltech Dialogic SS7 Protocols ISUP - Manual (Page 28)

Section 6 Interface to Application
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6.5.1 Alerting Request
This primitive is used by the application 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 Issued
Message type
ACM (Address Complete Message)
Mandatory parameters
None
Optional parameters
• Backward call indicators
Defaults to 0x1416 if not supplied i.e. Subscriber Free Ordinary
Subscriber, Charge Terminating access ISDN, ISDN used all the way
• Access transport
• Cause indicators
• Call reference
• Optional backward call indicators
• Remote operations
• Service activation
• Transmission medium used
• User to user indicators
May be used to accept user to user information service 1, 2 or 3
(previously requested in a set-up indication).
• User to user information
Discarded if user to user service 1 has not been accepted.
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
This parameter may be repeated (see Appendix E: ISUP Repeat
Parameters on page 197 ).