Unlike GXP21XX or GRP26XX phone models, there is no 'Secondary SIP Server' option under Account Setting in GXV33XX Android phones. The secondary registration can be done using the Virtual Account Group setting.
How to
1. You need to register and activate 2 SIP accounts by filling in the SIP User information, Auth ID, and passwords (for eg. Account 1 and Account 2).
2. At Account 1, go to Advanced Settings > Advanced Features > Virtual Account Group > Virtual Account Group 1.
3. Repeat step 2 at Account 2.
4. Go to Phone Settings > Call Settings > Enable Virtual Account Group Avaya Mode & set Number of Concurrent Registration for Virtual Account Group to '1'.
How does it work?
The phone would register in the order of account. For eg. If Account 1 fails to register, Account 2 will attempt registration. This also supports more than a secondary SIP server.
Notes
Each account has a different Local SIP Port under the Account's SIP Setting. Please note that do not configure the same Local SIP Port for the accounts under the same Virtual Account Group. This will cause the failover will not work with the Unregistered - 502 Bad Gateway error.
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