Avaya Octel 200 Installation And Maintenance Manual page 919

17.1 QSIG INTEGRATION OVERVIEW
Available beginning with Serenade 4.0, ISO QSIG integration uses the DTIC card as the connection
between the message server and the PBX. ISO indicates adherence to the most recent QSIG specification
developed by the International Standards Organization (ISO). Each DTIC card can have up to 30 ports
authorized with capacity-on-demand.
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This chapter must always be used in conjunction with the Configuration Note, which contains
specific information about the integration.
While QSIG is an ISO standard protocol that could allow the Octel 200/300 to integrate with various
switches, at the time of this writing, the only switch that has implemented the necessary Supplementary
Services to allow a satisfactory level of functionality in the integration is the Lucent Definity G3. The other
requirement from the message server perspective is that the switch support an E-1 connection. On the G3,
the card supporting the connection to the message server can be switched for T-1 or E-1; on the message
server side, the card used to connect is strictly E-1. When multiple G3s are connected to each other using
the QSIG protocol, it is possible to centralize the message server by connecting to one of the switches.
Consult the Configuration Notes for specific details regarding configuration and functionality.
The Adaptive Integration (X0031) software package required to support message waiting indication and
called party identification is included in the 4.0 software. Refer to the Adaptive Integration chapter for more
general information about Adaptive Integration.
With QSIG integration, one digital pathway between the PBX and the Octel 200/300 message server
transmits both call information and voice communications. For call source, ANI (automatic number ID)
digits are collected where they are available. The ANI information is then made available to Octel Designer
and Visual Messenger applications. The pathway used to transmit call information and voice is provided by
a 2 MB digital link from the PBX to the DTIC-E1 card. The bandwidth of the digital link is divided into 32
time slots. The first time slot, time slot 0, is for synchronization; time slot 16 is the data channel that
transmits the call information; and the other 30 time slots are available for voice and fax transmission.
Using time slot 16, which is referred to as the D-channel, call record information is sent so that the message
server has information about the source and destination of the call and the reason for its arrival. The
message server processes information from the data channel, answers the call and plays the appropriate
greeting. Message waiting indication uses the D-channel, so there is no requirement to designate channels
or ports to perform MWI tasks. This use of the D-channel is also referred to as Common Channel Signaling
(CCS).
As noted further in this chapter, operation of the integration differs significantly from that of earlier
integrations (e.g., RS−232, set emulation or Enhanced DTMF). Those integrations typically provide the
type of call (direct or forwarded), the source (calling party ID if internal or trunk group ID is external), the
destination (called party), and the reason for the forward (busy/no-answer/all calls forward). In these
integrations, the port appears to the switch as an analog or digital station. The caller who enters digits to
reach an extension is transferred and forwarded back to a different port if the call is not answered. The
transferring port disconnects in the absence of a busy or fast-busy signal.
In a QSIG integration, the message server itself is seen as a "transient PBX" rather than as a series of
stations "behind" the PBX. The transfer and forward back scenario no longer applies. For example, when
the server extends a call through the switch and reaches a station that is busy, that busy condition is reported
from the switch to the message server through CCS. The call remains on the port that answered originally,
and the caller is prompted as would be expected based on the configuration
PB60019-01
QSIG Integration 17−1
Octel 200/300 S.4.1