Avaya 1000 Installation And Commissioning Manual page 27

Scenario 3
The SIP client is currently registered to the MO SLG but the MO system goes down. GRMO system
is up and running.
1. The SIP client sends a PING/REGISTER request to the S1 IP address (that is, MO SLG IP
address) at regular intervals.
2. When MO SLG goes down, no response is sent back to client for the PING/REGISTER
request.
3. The SIP client times out on the PING request. The client then switches to the 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 messages 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.
Scenario 4
The SIP client is currently registered to GRMO SLG. The MO system comes back into service. The
GRMO system is up and running.
1. The SIP client sends a PING/REGISTER request to the S2 IP address (that is, the GRMO
SLG IP address) at regular intervals.
2. When the MO SLG is up, GRMO SLG starts ignoring the PING requests.
3. The GRMO SLG sends a 302 Moved Temporarily response for the REGISTER request from
the client. This SIP message contains the contact header set to MO SLG IP address (for
redirecting).
4. The SIP client receives the 302 Moved Temporarily and redirects the REGISTER request to
MO SLG.
5. The MO SLG sends a 200 OK response for the REGISTER request after the authentication
process.
6. 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.
7. The SIP client maintains regular keepalive messages 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.
June 2014 Branch Office Installation and Commissioning
Comments? infodev@avaya.com
MO-GRMO or PCS-SCS deployment
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