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ASAI and Call Control
4-26 Issue 7 May 1998
return_ack [optional] If this parameter is present, it indicates
that the ECS should return an acknowledgment to
the request. If this parameter is not present, then
the ECS does not return an acknowledgment.
uui_info [optional] UUI received in a successful Third Party
Make Call on the ASAI link is stored by the ECS
with the call for the life of the call or until overwritten
due to a later UUI IE associated with the call.
UUI from a Third Party Make Call will be sent in any
ISDN SETUP message for the call, in the Alerting
and Call Offered Event Reports, and in a Route
Request, if one is made.
The UUI IE sent over an ISDN trunk can contain
more data than the UUI IE sent to ASAI. This
happens when the ISDN trunk group is
administered with supplementary service protocol
other than B, and the UUI IE Treatment is set to
“shared”. The UUI for ASAI is packed within the
shared UUI before it is sent over an ISDN trunk,
and is unpacked at the other end.
This is transparent to the ASAI adjuncts, with two
exceptions:
1. If the maximum size UUI allowed on the ISDN
trunk is exceeded, then the lower priority data
items will be dropped. Whether or not this
means that ASAI UUI is dropped depends on
the priorities of the data items. These priorities
are administered on each trunk group form.
Each item stored in shared UUI uses two extra
bytes.Therefore, if the ISDN trunk group is
administered to allow a shared UUI length of 32
bytes then the ASAI UUI will be limited to 30
bytes instead of 32.
2. If a service provider, or customer equipment
other than a DEFINITY ECS (R6.3 or later) will
be interpreting the contents of the UUI IE, then
the trunk group used to place those calls should
have its UUI IE Treatment set to
“service-provider”. This sends the UUI as
specified by the ASAI application, without
change.
For more information, see the Section, ‘‘Integrated
Services Digital Network (ISDN),’’ in Chapter 12,
‘‘ASAI and Feature Interactions.’’