Avaya 1000 Installation And Commissioning Manual page 30

Overview
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.
Scenario 2 (SIP Client reset)
The SIP client is registering to the system for the first time. The GRMO system is down.
1. The SIP client sends a PING/REGISTER request to the GRMO SLG.
2. The GRMO SLG is down, so no response is sent back to the client for PING/REGISTER
request.
3. The SIP client times out on the PING request. The client then switches to the alternate proxy
(that is, the BO SLG) and sends a PING/REGISTER request to the BO SLG.
4. The BO SLG is aware that MO-SLG is up, so it ignores the PING request.
5. The BO SLG responds with a 302 Moved Temporarily for the REGISTER request. The
contact header of this SIP message contains the redirection IP address (that is, the MO
SLG).
6. The SIP client redirects the REGISTER message to the MO SLG.
7. The MO SLG responds with a 200 OK for the REGISTER request after the authentication
process.
8. 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.
9. The SIP client maintains regular keepalive messages with the active proxy in the form of
PING requests.
10. The SIP client maintains registration refreshes with the active proxy before registration timer
expiry.
Scenario 3 (SIP Client reset)
The SIP client is registering to the system for the first time. The MO system is down. (This use case
scenario also applies to when the MO and BO systems are down.)
1. The SIP client sends a PING/REGISTER request to the GRMO SLG.
2. The GRMO SLG is aware that MO SLG is down, so it sends a 200 OK response for the
PING request.
3. The GRMO SLG responds with a 200 OK for the REGISTER request after the authentication
process.
4. The SIP client sets 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.
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.
Branch Office Installation and Commissioning
30
Comments? infodev@avaya.com
June 2014