Avaya 1000 Installation And Commissioning Manual page 26

Overview
Scenario 1 (SIP client reset scenario)
The SIP client is registering to the system for the first time (that is, client power up). Both the MO
and GRMO systems are up and running. (This use case also applies to the scenario where the
GRMO system is down.)
1. On the SIP client reset, the client sends PING and REGISTER requests to the S1 IP address
(that is, the MO SLG IP address).
2. Because the MO SLG is up and running, the MO SLG sends a 200 OK response for the
PING request.
3. The MO SLG sends a 200 OK response for the REGISTER request after the authentication
process.
4. The SIP client configures the MO SLG as its active proxy. After this configuration, incoming
requests are received from this active proxy and any outgoing responses are sent to this
active proxy.
5. The SIP client maintains regular keepalive messages with the active proxy in the form of
PING requests.
6. The SIP client maintains registration refreshes with the active proxy before registration timer
expiry.
Scenario 2 (SIP client reset scenario)
The SIP client is registering to the system for the first time (that is, client power up). The MO system
is down; however, the GRMO SLG is up and running.
1. On the SIP client reset, the client sends a PING/REGISTER request to the S1 IP address
(that is, the MO SLG IP address).
2. The MO SLG is down. No response is sent back to the client for the PING/REGISTER
request.
3. The SIP client times out on the PING request. The client then switches to alternate proxy S2
IP address (that is, the GRMO SLG IP address) and sends a PING/REGISTER request to
the S2 IP address.
4. The GRMO SLG is aware that MO SLG is down, so it sends a 200 OK response for the
PING request.
5. The GRMO SLG sends a 200 OK response for the REGISTER request after the
authentication process.
6. The SIP client configures the GRMO SLG as its active proxy. After this configuration,
incoming requests are received from this active proxy and any outgoing responses are sent
to this active proxy.
7. The SIP client maintains regular keepalive message with the active proxy in the form of
PING requests.
8. The SIP client maintains registration refreshes with the active proxy before registration timer
expiry.
Branch Office Installation and Commissioning
26
Comments? infodev@avaya.com
June 2014