SLS transitions between four possible SLS states: Unregistered, Setup, Registered, and
Teardown.
Related topics:
on page 108
on page 109
Unregistered state
This is the normal state in which SLS waits for an H.248 registration request from the Branch
Gateway. When SLS receives the request, it registers the Branch Gateway and transitions to
the Setup state.
Setup state process
In this transitional state, SLS performs the following activities:
1. Checks for proper provisioning data. If there is insufficient provisioning, the
registration request is denied, and SLS returns to the Unregistered state.
2. Initializes SLS components, such as Gatekeeper data (for example, IP endpoint’s
E.164 addresses and passwords), dial plan, and ARS routing.
3. Registers with the Branch Gateway.
4. Creates the H.323 Gatekeeper socket after successful registration.
When Setup is complete, SLS transitions to the Registered state.
Registered state process
SLS can only process calls while it is in the Registered state in which it performs the following:
1. Constructs endpoint objects based on board insertion and IP registration.
2. Tears down endpoint objects based on board removal and IP unregistration.
3. Handles registration requests from H.323 endpoints that properly authenticate by
using their extension number as a 'terminal alias', and the password as the
registration encryption key.
4. Handles stimuli from all interfaces to establish and remove calls.
SLS remains in the Registered state as long as the socket to SLS is open.
Standard Local Survivability (SLS)
108 Administering Avaya G430 Branch Gateway
October 2013
Summary of Contents for G430
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