Agent login

[arvind.zapp]

Hi
i am having some problem with yealink phones with regard to Agent login feature in business continuity environment.
I have explained the scenario below:

1.Put both site1 and site2 up in Business Continuity environment
2.agent login from the phone.
3.Phone sent register and subscribe message to any one the site and Agent is logged from the phone.
4.Now put the site down(where it is register currently).

Problem:
========
Phone logged out automatically and register message sent to another site(active one). But when we try to login from the phone after logout ,it displayed as login failure and login as guest account.

i have attached the logs. can anyone give some comment on it? is there anything specific in configurations that we need to mention in yealink for BC.