Managing Data Calls
Modem Pooling
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Administrator’s Guide for Avaya Communication Manager
November 2003
Considerations
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On data calls between a data module and an analog-data endpoint, Return-to-Voice releases the
modem and returns it to the pool. The telephone user connects to the analog-data endpoint.
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For traffic purposes, the system accumulates data on modem-pooling calls separate from voice
calls. Measurements on the pools also accumulate.
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Modem Pooling is not restricted. Queuing for modems is not provided, although calls queued on a
hunt group retain reserved modems.
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Avoid mixing modems from different vendors within a combined pool because such modems may
differ in transmission characteristics.
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Each data call that uses Modem Pooling uses four time slots (not just two). As a result, heavy
usage of Modem Pooling could affect TDM bus-blocking characteristics.
•
Tandem switches or servers do not insert a pooled modem. The originating and terminating
servers or switches insert a pooled modem.
Interactions
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Call Detail Recording
Data call CDR records the use of modem pools on trunk calls.
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Data Call Setup
Data calls to or from a TDM cannot use Modem Pooling.
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Data Privacy and Data Restriction
The insertion of a modem pool does not turn off Data Privacy or Data Restriction.
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Data-Only Off-Premises Extensions
Calls to or from a Data-Only Off-Premises Extension cannot use Modem Pooling, when this type
of digital-data endpoint uses a TDM.
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DMI Trunks
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.
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DS1 Tie Trunk Service
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.