CHAPTER
3-1
Cisco VISM Installation and Configuration Guide
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
3
VISM Functional Description
The functions performed by VISM are described in the following sections:
• “TDM Line-Handling Function” section on page 3-2
• “Bearer Processing Function” section on page 3-3
• “Signaling Function” section on page 3-5
• “ATM Voice Data Processing Function” section on page 3-11
• “Call Control Function” section on page 3-15
• “Embedded VISM Management Function” section on page 3-19
Figure 3-1 shows the functional blocks of VISM. Items with single asterisks indicate VoIP switching and
switched AAL2 PVC functions. Items with double asterisks indicate AAL2 trunking functions. Items
without asterisks indicate VoIP switching, switched AAL2 PVC, and AAL2 trunking functions.