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Chapter 3 — DPNSS1/DASS2 features description and implementation Page 739 of 1536
DPNSS1 Extension Three Party Service
The DPNSS1 Three-party Service feature allows a controlling party to place
an established party on hold and make an inquiry call to a third party. The
controlling party may then transfer the held party to the inquired-to party, or
form a three-party conference. The three parties may be located anywhere
across a Meridian 1 DPNSS1 network.
The controlling party may use a 500/2500 set, M1000 series set, or Meridian
feature telephone. On a 500/2500 set or M1000 series set, an inquiry call may
be initiated by pressing the Recall key or performing a switch-hook flash. On
a Meridian feature phone, an inquiry call may be initiated by pressing the
Transfer or Conference key.
After a call transfer, this feature provides messaging that allows DPNSS1
Route Optimization supplementary service to be invoked, in order to
optimize the routing of the call through the DPNSS1 network. Also, user set
displays are updated, and applicable DPNSS1 access restrictions are applied.
These include:
— restrictions configured as part of the Trunk Barring feature;
— Public Switch Telephone Network call barring, configured at the
telephone set level;
— system restrictions dependent on trunk types (not configurable).
The following access restrictions are not supported:
— Tenant Service restrictions;
— Network Class of Service restrictions.
This feature handles various types of misoperation when the controlling party
attempts to transfer from the held party to the inquired-to party. If the user of
a Meridian feature phone presses the Transfer key a second time after having
already pressed it once to transfer the call, the action is ignored.
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