Welltech Dialogic SS7 Protocols ISUP - Manual (Page 62)

Section 6 Interface to Application
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6.6.10 Facility Indication
This message is issued by ISUP to indicate that the remote party is either
requesting a user to user supplementary service during the active (speech)
stage of a call, or the activation of a particular facility.
Facility requested indication
Message type
FAR (Facility Request Message)
Mandatory parameters
• Facility indicator
• User to user indicators
ITU-T mode only
Optional parameters
• Call reference
The following optional parameters are supported in ITU-T mode only:
• Connection request
• Parameter compatibility information
The following optional parameters are supported in ANSI mode only:
• Business group
• Called party number
• Calling party number
• Charge number
• Generic number (address)
• Generic digits
• Network transport
Action requested indication
Message type
FAC (Facility Message)
Mandatory parameters
None
Optional parameters
• Remote operations
• Service activation