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Cisco VISM Installation and Configuration Guide
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
Chapter3 VISM Functional Descriptio n
Signaling Function
Figure 3-3 shows the messages involved in CAS processing with the VoIP switching and switched AAL2 PVC operating modes.
Figure3-3 CAS Processing—Message Structure
Figure 3-4 shows the local CAS processing call setup message sequences which occur between VISM, the call agent, and the telephone equipment on the DS0.
DSPs
& Drivers Call
Agent
5
3237
Notification
Requests
Notify
Messages
A-B bits
Digits
A-B bits
Digits
Tones
T
1/E1 Lines
Events
DTMF, MF, Fax, & Modem tones
Off/on hook
Hook flash
Start/End MF string
Actions
Tx A-B bits
Report A-B bits
Present dial string
Report tone generation
Begin/End tone generation