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Avaya Modular Messaging Concepts and Planning Guide
8-4
November 2004
Avaya Modular Messaging Concepts and 
Planning Guide
of H.323 trunk groups configured as tie trunks supporting Q-Signaling 
(QSIG) features. QSIG is a standards-based, private networking protocol, 
based on Q.931 standards (ISDN). Signaling information and MWI 
information are transmitted using QSIG messages embedded in an H.323 
packet. 
Note: H.323-based IP integration currently does not support fax 
capabilities.
QSIG D Channel
ISDN protocols, such as QSIG, carry signaling information in the D 
channel for calls where voice data is carried in separate but associated 
bearer channels. This is referred to as Common Channel Signaling (CCS). 
The data in this channel can be used for integration.
For QSIG integration, Modular Messaging supports 23-port T1 port 
boards and 30-port E1 port boards.
The Avaya switches that Modular Messaging supports with T1 and E1 
QSIG integration are Avaya Communication Manager (release 1.1 or 
later) and Avaya DEFINITY (release 10 or later).
Digital Set 
Emulation
Many switch vendors use proprietary digital protocols to connect their 
own hand sets to the switch. These protocols provide call control and 
integration information. Examples of such switches include Nortel 
Meridian and Siemens.
Inband DTMF 
integration
With inband integration, the switch sends DTMF tone strings to the MAS 
port when the call is first placed to the port. These DTMF tone strings are 
sent within the voice channel, and not on a separate data channel, thus the 
name ‘inband’ integration. MAS units are configured to recognize the 
format of these tone strings and interpret the information. 
RS-232 serial 
integration
With RS-232 serial integration, a separate RS-232 serial communications 
interface is used to send control information between the switch and the 
MAS. Avaya Modular Messaging supports a number of RS-232 serial 
integration protocols to send data to the MAS. The most widely used 
protocol is the standard Simplified Message Desk Interface (SMDI) 
protocol. In other cases, the RS-232 interface is proprietary to a particular 
switch.
Note: Some switches can support only a single serial interface for 
one hunt group. MAS units, when used in a multiserver voice 
mail domain, can operate with a single serial interface. This 
is known as remote integration.