Nortel Networks NN43001-106 User Manual

Page 143

143

AC15 Recall: Transfer from Norstar

Contents

This section contains information on the following topics:

"Feature description" (page 143)

"Operating parameters" (page 144)

"Feature interactions" (page 144)

"Feature packaging" (page 148)

"Feature implementation" (page 148)

"Feature operation" (page 150)

Feature description

The AC15 Recall: Transfer from Norstar (TRRL) feature is typically used
in network configurations where a great number of branch nodes (small
offices using a Norstar key system) are linked to a centralized system with
back office functions (for example, answering facilities, Public Switched
Telephone Network access) using AC15 TIE trunks. With this feature,
when the system receives a call that has been transferred from Norstar, it
can reuse the same AC15 circuit during the three-party phase and can
release it when the transfer is complete. Therefore, call blocking between
the Norstar and the system is reduced, and the number of necessary AC15
trunks could potentially be reduced.

A call between Party X (on the system) and Party Z (on Norstar) is
established. Party Z invokes the transfer feature on Norstar. A recall signal
(similar to a dial pulse 1) is sent over the AC15 trunk, which is detected by
the Extended Flexible E&M pack (XFEM) card on the system. Party X is
placed on hold by the system, dialtone is provided to Party Z, and dialed
digits are expected on the trunk. A new call to Party Y progresses based

Nortel Communication Server 1000

Features and Services - Book 1 of 6 (A to B)

NN43001-106

01.04

Standard

Release 5.0

27 July 2007