Recovery error: the SPA phone performs failover to the secondary proxy when the SIP request gets no response from the primary proxy.
Recovery: the phone attempts to re-register with the primary proxy while it is registered or actively connected to the secondary proxy.
Note In version 7.5.5 and earlier versions, to control re-registration in case of failover or recovery, "BT" was configured in the parameter . From version 7.5.6 onwards, this is replaced by another new parameter .
Previous behavior (7.5.5 and earlier):
In the failover/recovery scenario, the phone remains registered on the primary proxy, but makes and receives calls on the alternate proxy.
The SPA IP phone is re-registered in case of failover or recovery with "BT" configured in the field in the "Answer Status Code Handling" section of the SIP tab.
Note: The parameter is used to invoke failover upon receipt of the specified response codes.
New behavior (7.5.6):.
When the new parameter is set to yes, the phone cancels the logging and logs as the previous behavior (when a special value "BT" is set in the parameter .
The solution is to remove the definition "BT" and add the new parameter, to control the phone to automatically register to the failover proxy when the failover action is executed The INVITE message will be forwarded to the new proxy.