Chapter 2 Telephony Applications Using Vism; Tandem Switch Offloading; Figure 2-1 Vism Used In A Tandem Switch Offloading Application - Cisco Voice Interworking Services (VISM) Installation And Configuration Manual

Telephony Applications Using VISM
This chapter describes the VISM card and the ways it is used in telephony applications to transport
traditional TDM voice traffic as digitized voice traffic over ATM networks. The following topics are
discussed:
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•
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Tandem Switch Offloading

Figure 2-1
traffic across an ATM network instead of the Public Switched Telephone Network (PSTN). VISM acts
as the voice gateway in this application. Use VISM in the VoIP switching or switched AAL2 PVC
operating mode to enable this application.
Figure 2-1
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
"Tandem Switch Offloading" section on page 2-1
"Multiservice Access" section on page 2-3
"AAL2 Trunking" section on page 2-3
shows VISM used to offload a Class 4 tandem switch by transporting a portion of the voice
VISM Used in a Tandem Switch Offloading Application
MGX 8850
with VISM
V
Central
Office
Call Agent
Class 4
Switch
C H A P T E R
IP Network
SS7 Network
PSTN Network
Cisco VISM Installation and Configuration Guide
2
2-1