Avaya Media Gateway G250, Руководство администратора, Страница: 137 / 840

Issue 5 June 2008 137
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.
Teardown
SLS transitions to the Teardown state whenever the following occur:
●
The G250/G350 administrator uses the
set sls disable
command from the
G250/G350 CLI or manual MIB browser using the SNMP read/write attribute
avSurvAdminState.
●
The G250/G350 closes the SLS socket after maintenance determines that it has
completed an H.248 registration with the primary MGC.
●
SLS determines that it needs to unregister with the G250/G350 due to internal error
conditions.
Teardown state activities
1. Tears down endpoint objects.
2. Sends unregistration requests to IP endpoints that are not on active calls. IP endpoints
lose registration with SLS and display the discovered IP address during re-registration with
an MGC.
3. Closes the H.323 Gatekeeper socket.
After Teardown is complete, SLS transitions to the Unregistered state and starts searching at
the top of the MGC list for a controller.
SLS interaction with specific G250/G350 features
SLS interacts differently with the various G250/G350 features.
Direct Inward Dialing in SLS mode
Direct Inward Dial (DID) is a service offered by telephone companies that enables callers to dial
directly into an extension on a PBX without the assistance of an operator or automated call
attendant.