Provisioning Data; Entering Sls Mode - Avaya G250 Administration

Provisioning data

SLS requires that the G250 Media Gateway has connected to an MGC at least once and has
received provisioning information, including:
Communication Manager port information through the H.248 control channel
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- Tone sources, including a distinctly different dial tone to inform users that the system is
operating in survivable mode
- Loss plan
Communication Manager analog resource information through the CCMS channel
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For information on administering SLS in the Avaya Communication Manager, see "Network
Recovery" in Maintenance Procedures for Avaya Communication Manager 3.0, Media
Gateways and Servers, 03-300432.
SLS also requires PIM configuration data, some of which the G250 extracts from the Avaya
Communication Manager translations. PIM aggregates the required data and copies the
provisioning data over a secure communication path to non-volatile RAM (NVRAM) on the
G250. After the initial data collection, PIM retains a copy of the data set for each G250. This set
is compared with subsequent data sets to determine if anything has changed:
If the data set changes, then the newer data set is pushed down to the media gateway.
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If the data set does not change, then the data set in NVRAM remains unchanged.
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Users can schedule when to collect and push data, perform scheduled and manual backups,
and enable and disable SLS, as well as display (but not change) the data to ensure correct
information.
If PIM is unavailable, the SLS data set can be manually configured in the G250 CLI. For
information on configuring SLS, both manually and via PIM, see

Entering SLS mode

When SLS is enabled, the MGC list displays a fifth element called survivable-call-engine. This
element is always past the Transition Point. After the Link Recovery search concludes for the
primary MGC list (entries above the Transition Point), it then searches the alternate MGC list
(entries below the Transition Point), ending with survivable-call-engine, the last choice for the
G250.
When the Link Recovery search settles on the survivable-call-engine entry in the MGC list, then
the G250 registers with SLS (resident on the G250) for its call control. This section discusses
each of the four possible SLS states and the transitions from one state to another.
SLS overview
Configuring SLS on page 83.
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