Inter-Tel AXXESS Manual page 585

Trunk Group PRI Call By Call Feature
10.21 System trunk groups provide limited access to PRI Call By Call services. Each trunk
group that contains B-channels can be assigned a PRI Call By Call feature to use for outgoing
calls. The supported Call By Call features include switched digital circuit services, foreign
exchange, TIE services, local exchange, OUTWATS, inter-exchange carrier services, and cus-
tom AT&T and Nortel private networks, features, and services. If the customer wants to use
more than one PRI Call By Call feature, there can be multiple trunk groups, each programmed
to use a different feature. The customer then can select the Call By Call feature by selecting the
trunk group associated with the feature.
10.22 When the trunk group has a programmed Call By Call feature, all channels within the
specified trunk group indicate the PRI Call By Call feature code in the outgoing ISDN mes-
sage. Each outgoing ISDN call sends a SETUP message on the Primary Rate D-channel that
contains the B-channel (voice channel) assignment, called digits information, and the network-
specific facility. The PRI Call By Call feature is specified within the network-specific facility,
ISDN information element which contains the Call By Call feature code.
10.23 To properly program the PRI Call By Call feature, the installer must analyze the cus-
tomer's ISDN outgoing call traffic and configure the amount of B-channels needed to support a
particular Call By Call feature or service. In the service order, the installer must request the
Call By Call service for the PRI span or a subset of channels.
10.24 The installer selects the Call By Call feature during trunk group programming by select-
ing the desired PRI Call By Call feature. After the trunk group has been created and assigned
to a Call By Call feature, the appropriate ISDN B-channels are programmed into the trunk
group.
10.25 The station user dials ARS or a PRI trunk group extension. The system selects the trunk
group's programmed Call By Call feature. The system automatically inserts the Call By Call
feature into the ISDN call control message and transmits the message to the public network.
The Public Network accepts or rejects the requested Call By Call feature in the ISDN message.
10.26 The PRI Call By Call feature supports the following services:
•
Call By Call Inactive
•
AT&T WATS Band
•
AT&T Banded OUTWATS
•
AT&T Foreign Exchange
•
AT&T TIE Trunk
•
AT&T Local Operator
•
AT&T Carrier Operator
•
AT&T MEGACOM 800
•
AT&T MEGACOM
•
AT&T INWATS
•
AT&T WATS Maximal Band
•
AT&T ACCUNET Switched Digital
•
AT&T International LDS
•
AT&T International 800
•
AT&T Electronic Tandem Network
•
AT&T Private Virtual Network
•
AT&T DIAL-IT 900 / MultiQ
•
AT&T National ISDN INWATS
Trunk Group PRI Call By Call Feature
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INTER-TEL AXXESS MANUAL VERSION 11.0 – May 2008
System Features
Page 5-59
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