The phones register to Avaya Cloud Office and operate as Avaya Cloud Office phones with access to the users contacts, call history, and programmable button settings.
Avaya Cloud Office provides the phones with the address details of their persistent gateway, in this case, IP Office.
The phones use regular SIP OPTIONS messages to poll the status of Avaya Cloud Office. IP Office has no connection to Avaya Cloud Office.
When the Avaya Cloud Office connection is lost:
If a phone does not receive an acknowledgment to the SIP OPTIONS message within the specified time, the phone assumes that the Avaya Cloud Office connection is lost. The phone begins the process to failover to IP Office.
The phone displays Limited Service along with the limited-service icon on the phone screen.
