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Signaling Function
Figure 3-5
Figure 3-5
For RUDP links between VISM and the call agents, use a session with a session manager.
A session represents a single RUDP link to a specified call agent. Sessions are organized into session
groups, and session groups are organized into session sets. VISM architecture supports up to 64 sessions
and up to 16 session groups; however, Release 2.2 supports one session.
Multiple RUDP links for a specified call agent are set up as sessions in a single group. A group is
required for each call agent for which CCS signaling is to be backhauled. Within a group, each session
is assigned a priority level. When an active session fails, the session manager switches to the next highest
priority backup session within the group.
sessions.
Figure 3-6
Call Agent A
VISM maintains a set of counters for the collection of statistics at both the Q.921 and Q.931 protocol
levels. The collected statistics include the number of frames/packets/bytes sent and received, the number
of resets, the number of discards and retransmissions, etc. Refer to the CCS session and LAPD display
commands in
session and LAPD display commands.
Cisco VISM Installation and Configuration Guide
3-10
shows the VISM PRI/backhaul process.
PRI/Backhaul Path
PBX
D channel
B channel
RUDP Session Hierarchy
Session
Group 1
Sessions to
Chapter 5, "CLI Commands,"
Call Agent
PRI Backhaul
Path
Router
V
MGX 8850
with VISM
Figure 3-6
shows the hierarchy of RUDP sets, groups, and
Session
Set
Session
Group 2
Sessions to
Call Agent B
for more information on collected statistics for the CCS
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
Chapter 3
VISM Functional Description
Signaling
Network
Packet
Network
Voice Payload
Session
Group 3
Sessions to
Call Agent C
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