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ASAI and Call Control
Issue 7 May 1998
4-5
ACK (Positive Acknowledgement) Parameters
If the return_ack is present in the adjunct’s request, the ECS returns an ACK
containing the party_id, call_id, connected_number_id of the originator on the call,
and also Universal Call ID, if it is present, (Release 6 or greater). If the
return_ack is not present in the request, no ACK is returned.
uui_info [optional] UUI information 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.’’