Emergency Transfer Relay (Etr) In Sls Mode - Avaya G250 Administration

In this transitional state SLS:
1. Tears down endpoint objects
2. Sends unregistrations 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 has completed, SLS transitions to the Unregistered state.

Emergency Transfer Relay (ETR) in SLS mode

Emergency Transfer Relay (ETR) on the G250 connects or "latches" a CO trunk port (V304) to
an analog station port (V305), allowing the user to access the PSTN for emergency calls in
these conditions:
Power outage
●
Loss of MGC, including SLS, dropping calls on either the trunk port or the station port.
●
Once the G250 registers with SLS, ETR unlatches.
For ETR configuration instructions, see
(ETR) on page 199.
If SLS is disabled, then ETR remains latched unless the media gateway registers with an MGC
or the ETR state is changed through a CLI command or SNMP. There can only be one ETR call,
so upon registering with an MGC, the G250 ports are polled to determine an ETR call is active.
If there are none, ETR disengages, and the ports are returned to normal service. Otherwise, the
gateway remains in ETR mode until the V304 and/or V305 ports are idle. If the gateway is still in
ETR mode after the gateway registers with a new MGC, Avaya Communication Manager
maintenance must busy out the ports until it receives notification that the ports are idle and
available for use.
You can busy out the ports from the SAT either before or after ETR mode is invoked, but you
might get abort codes depending on the circumstances:
If you issue the busyout board or busyout port command and
●
- the ports are idle, then the system busys out the ports.
- the ports are in use, then the system returns an Abort Code 1010, "port already busy."
If you issue the release board or release port command, but the gateway has
●
control of these ports while it is in Emergency Transfer mode, the system returns Abort
Code 1426, "cannot release ports, MG has control."
Chapter 12: Configuring Emergency Transfer Relay
SLS overview
Issue 1.1 June 2005 81