Sls Interaction With Specific G250/G350 Features; Direct Inward Dialing In Sls Mode - Avaya G250 Administration

Configuring Standard Local Survivability (SLS)
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

The 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.
Note:
DID is a method of routing calls that applies to both analog and digital (T1/E1)
Note:
lines. However, while the method is typically referred to as DID in the analog
world, it is usually called Dialed Number Identification Service (DNIS) in the digital
world. Despite the difference in names, the concept is the same.
The gateways support DID central office trunk interfaces, and the digit transmission from the
central office is configurable when ordering the service:
Immediate - the DID signaling starts immediately after the central office seizes the analog
●
DID trunk by closing the loop (across tip and ring). In addition, analog DID trunk lines only
support inbound calls. For that reason, CPE (Customer Premise Equipment) utilizing DID
trunk lines for inbound routing would utilize loop-start (for example) lines for outbound
transmission.
Wink - the DID signaling starts after the phone reverses battery polarity and sends the
●
"wink" to the central office.
An analog 2-wire DID trunk line is different from a standard analog loop-start line.
WARNING:
With analog DID trunk lines, the battery (power feed) to the line is supplied by the
phone system. With a standard loop-start line the power is supplied by the central
office, and this is why damage can occur from connecting a loop-start PSTN trunk
to the DID port.
The number of sent digits (3-4 typically) and signaling type (Pulse/DTMF) are also configurable
at ordering time.
106 Administration for the Avaya G250 and Avaya G350 Media Gateways