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Maintenance and Failover in the Packet Gateway Overview
By providing redundancy for both the Routing Engine and the
service PICs, the packet gateway high-availability (HA) architecture
allows for a multilevel redundant solution. This solution ensures
service and call continuity, which is necessity for VoIP services.
Figure 24 shows the packet
gateway HA architecture.
Figure 24: Packet Gateway HA Architecture
Table 15 indicates
how service PIC failure and Routing Engine failure affect different
types of services.
Table 15: How Service PIC and
Router Engine Failures Affect Service and Call Continuity
| Service | Service PIC Failure | Routing Engine Failure |
|
Stable H.248 contexts
|
Call continuity—All calls are lost.
Service continuity—Provided when the backup service PIC
is available.
|
Call continuity—All existing calls are maintained through
the failure
Service continuity—New calls and session can be established
when the backup Routing Engine takes control.
|
|
H.248 contexts are modified
|
Call continuity—All existing call states are lost.
Service continuity—Calls and sessions that are in a Setup
state (gates and terminations not fully defined) are lost
|
Call continuity—All existing call states are lost.
Service continuity—Calls and sessions that are in a Setup
state are lost.
|
|
Connection to the PGC
|
Call continuity—All calls are lost.
Service continuity—Provided when the backup service PIC
is available.
|
Call continuity—No calls are lost.
Service continuity—Provided when the backup Routing Engine
takes control.
|
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