Avaya Communication Manager Administrator's Manual page 542

Managing Data Calls
Considerations
On data calls between a data module and an analog-data endpoint, Return-to-Voice
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releases the modem and returns it to the pool. The telephone user connects to the
analog-data endpoint.
For traffic purposes, the system accumulates data on modem-pooling calls separate from
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voice calls. Measurements on the pools also accumulate.
Modem Pooling is not restricted. Queuing for modems is not provided, although calls
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queued on a hunt group retain reserved modems.
Avoid mixing modems from different vendors within a combined pool because such
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modems might differ in transmission characteristics.
Each data call that uses Modem Pooling uses four time slots (not just two). As a result,
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heavy usage of Modem Pooling could affect TDM bus-blocking characteristics.
Tandem switches or servers do not insert a pooled modem. The originating and
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terminating servers or switches insert a pooled modem.
Interactions
Call Detail Recording
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Data call CDR records the use of modem pools on trunk calls.
Data Call Setup
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Data calls to or from a TDM cannot use Modem Pooling.
Data Privacy and Data Restriction
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The insertion of a modem pool does not turn off Data Privacy or Data Restriction.
Data-Only Off-Premises Extensions
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Calls to or from a Data-Only Off-Premises Extension cannot use Modem Pooling, when this
type of digital-data endpoint uses a TDM.
DMI Trunks
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If you place a data call from a local analog-data endpoint to a DMI trunk, you must dial the
data-origination access code to obtain a modem. Data calls on DMI trunks to local
analog-data endpoints automatically obtain modems.
DS1 Tie Trunk Service
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Connect modems used for Modem Pooling to AVD DS1 tie trunks via Data Terminal Dialing
or by dialing the feature-access code for data origination.
542 Administrator Guide for Avaya Communication Manager