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Standard Local Survivability (SLS) – Everything You Always Wanted to Know. RMAUG Professional Development Series 11/17/2010 Dwight Reifsnyder.

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standard local survivability sls everything you always wanted to know

Standard Local Survivability (SLS) – Everything You Always Wanted to Know

RMAUG Professional Development Series


Dwight Reifsnyder


“If you have an apple and I have an apple and we exchange apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas.”

George Bernard Shaw

sls eyawtk overview
SLS – EYAWTK Overview
  • Avaya Survivability Options
  • SLS Features
  • BVSD Application
  • Programming Tips/Tricks
  • Real world results
avaya survivability options 3 1
Avaya Survivability Options (3.1)
  • ESS – Enterprise Survivable Server
    • ESS allows media servers to be used as alternate controllers within a system by leveraging IP control of port network gateways and can be completely independent of the main servers both functionally and geographically. ESS protects the communication system against a catastrophic main server failure and, at the same time, provides service to port network gateways that have been fragmented away from their current controlling entity. (Original white paper definition from my hero, Greg Weber
  • LSP – Local Survivable Processor
    • Avaya offers the Local Survivable Processor to continue to provide service in the case of broken connectivity between remote sites and main locations. In addition, Avaya empowers the administrator with the ability to define how the system behaves in the case of lost network connectivity. CM Featureset is still 3.0?, this is way is now AKA Enhanced Local Survivability
  • SLS – Standard Local Survivability
    • SLS is a configurable software module that enables a local Media Gateway to provide a core set of MGC functions when no link is available to the CM server, a Local Survivable Processor (LSP), or an Enterprise Survivable Server (ESS).
avaya survivability options 6 0
Avaya Survivability Options (6.0)
  • New Definitions…
    • SCS - Survivable Core Server (ESS)
    • SRS – Survivable Remote Server (LSP)
avaya survivability options 1 0
Avaya Survivability Options (1.0)
  • Survivable Remote Processor (SRP): In an SRP option, DEFINITY server SI provided continued service for a single fiber-Port Network Connected Center Stage Switch (fiber-PNC CSS) port network.
  • ATM WAN Spare Processor (WSP): In a WSP option, multiple DEFINITY server R processor port networks provided continued service for systems with ATM port network connectivity
resilient vs redundant
Resilient vs. Redundant
  • In engineering, redundancy is the duplication of critical components of a system with the intention of increasing reliability of the system, usually in the case of a backup or fail-safe.
  • In computer networking resilience is the ability to provide and maintain an acceptable level of service in the face of faults and challenges to normal operation.
sls features what it does
SLS Features (what it does)
  • Call capability for analog, DCP, and IP phones
  • ISDN BRI/PRI trunk interfaces
  • Non-ISDN digital DS1 trunk interfaces
  • Outbound dialing through the local PSTN (local trunk gateway) from analog, DCP, and IP phones
  • Inbound calls from each trunk to pre-configured local analog or IP phones that have registered
  • Direct inward dialing
  • Multiple call appearances
  • Hold and call transfer functions
  • Contact closure feature
  • Local call progress tones (dial tone, busy, etc.)
  • Emergency Transfer Relay (ETR) in cases of power loss
  • Auto fallback to primary MGC
  • IP station registration
sls limitations what it doesn t
SLS Limitations (what it doesn’t)
  • Many small business customers employ custom calling features such as call waiting, from the BOC/LEC, attempting a more PBX-like capability. These features are not supported by SLS.
  • Calling party name/number information to digital station displays
  • Caller ID on outgoing analog station calls
  • Caller ID on incoming analog loop-start trunk calls
  • Three party conferences
  • Last Number Redial
  • Call Forwarding-Busy/Don’t Answer
  • No Music On Hold source or announcement playback
  • Call Center features, including ASAI
  • Connection Preserving Failover/Failback for H.248 Gateways
sls is not cm
SLS is Not CM!
  • 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.
handsets supported
Handsets Supported
  • Analog – 2500
  • DCP – 2402, 2410, 2420, 6402, 6402D, 6408, 6408+, 6408D, 6408D+, 6416D+, 6424D+, 8403B, 8405B, 8405B+, 8405D, 8405D+, 8410B, 8410D, 8411B, 8411D, 8434D
  • IP - 4601, 4602, 4602sw, 4610sw, 4612, 4620, 4620sw, 4621, 4622, 4624, 4625, 1603*, 1608*, 1616*, 9610*, 9620*, 9630*, 9640*, 9650*

* map to similar 46xx handset

sls operates at the gateway
SLS Operates at the Gateway
  • In contrast to the server-based survivability features, SLS operates entirely from the media gateway and requires a data set comprised of Avaya Aura Communication Manager translations (survivable ARS analysis and configuration data).
sls configuration data
SLS 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 the PIM, the data set can be configured manually from individual media gateways using CLI commands.
cm config add gateways
CM Config – Add Gateways
  • change node-names ip
cm config set recovery rule
CM Config – Set Recovery Rule
  • change system-parameters mg-recovery-rule 1
cm config media gateways
CM Config – Media Gateways
  • change media-gateway 8
cm config stations
CM Config – Stations
  • Change station
gateway config station
Gateway Config - Station


station 5781 ip

set cor unrestricted

set password xx

set type ip4620


gateway config 911 trunk
Gateway Config – 911 trunk


trunk-group 1 loop-start

set dial dtmf

set tac 121

add port v101


set fac ars1 9


dial-pattern 911

set max 3

set min 3

set tgnum 1

set type emergency

set deny n


gateway config enable sls
Gateway Config – Enable SLS


set max-ip-registrations 240

set slot-config v1 mm711


set sls enable

mgc list and timers
MGC list and Timers!

set mgc list,

set reset-times primary-search 1

set reset-times total-search 2

set reset-times transition-point 1

summary bvsd sls config
Summary – BVSD SLS Config
  • By using existing POTs line, no additional costs are incurred
  • Because we use defined extension ranges SLS configuration is simple and static
  • LSP provides redundancy, SLS provides a third level of resilience
  • Reliability of 911 (life safety) services are enhanced with no additional costs