I am facing issue related to presence/ shared presence for agents in callcenter(mod_callcenter).

Suppose we are dialling a user 1001@example.com and it is a shared user in two phones. Shared presence works perfectly if we directly dial extension 1001.

But if same extension is configured as agent of callcenter and call is bridged to agent(extension) through callcenter, shared presence does not work. Freeswitch does not generate notify for agent state change. 

Is this expected behaviour ? If not then what can fix this ? 

Thanks in advance