Chapter 5: Configuring Standard Local Survivability (Sls) On The G250; Sls Overview - Avaya G250 Administration

Chapter 5: Configuring Standard Local Survivability
Standard Local Survivability (SLS) provides a local G250 with a limited subset of MGC
functionality when there is no IP-routed WAN link available to an MGC or no MGC is available.
Note:
SLS is not supported on the G350 or the G250-BRI.
Note:
This chapter provides information about configuring SLS on the G250 and includes the following
sections:

SLS overview

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Configuring SLS
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SLS overview
SLS provides:
Call capability between analog and IP stations
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Outbound dialing through the local PSTN (local trunk gateway) from analog and IP phones
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Inbound calls from each trunk to pre-configured local analog or IP phones that have
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registered
Local call progress tones (dial tone, busy, and so on)
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Emergency Transfer Relay (ETR) in survivable mode on the G250 hardware in cases of
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power loss
IP station registration
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SLS is not a replacement for ESS or LSP survivability, which offer full call-feature functionality
and full translations in the survivable mode. Instead, SLS is a cost-effective survivability
alternative offering limited call processing in survivable mode and no special station features.
Although the G250 has an option to host an S8300 Media Server in ICC or LSP mode, SLS
offers both local survivability and call control.
In contrast to the server-based survivability features, SLS operates entirely from the media
gateway and requires a data set comprised of Avaya Communication Manager translations
(Survivable ARS Analysis and configuration data). This data set is compiled and distributed to a
group of devices using the Provisioning and Installation Manager (PIM). In the absence of PIM,
the data set can be configured manually from individual media gateways using CLI commands.
For instructions on configuring SLS, see
(SLS) on the G250
Configuring SLS on page 83.
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