SS7 - ISUP Answer Message (22/Q.763 (09/97))

A message sent in the backward direction indicating that the call has been answered. In semi-automatic working, this message has a supervisory function. In automatic working, this message is used in conjunction with charging information in order to:

ParameterTypeLength (octets)
Message typeF1
Backward call indicatorsO4
Optional backward call indicatorsO3
Call reference (national use)O7
User-to-user indicatorsO3
User-to-user informationO3-131
Connected numberO4-?
Access transportO3-?
Access delivery informationO3
Generic notification indicatorO3
Parameter compatibility informationO4-?
Backward GVNSO3-?
Call history informationO4
Generic numberO5-?
Transmission medium usedO3
Network specific facility O4-?
Remote operations O8-?
Redirection numberO5-?
Service activationO3-?
Echo control informationO3
Redirection number restrictionO3
Display informationO3-?
End of optional parametersO1


NOTE 1 - This parameter may be repeated.
NOTE 2 - Peer-to-peer interworking with an earlier version of ISUP may result in format errors and lead to the release of the call.