[asterisk-users] Track Agent login/logoff status

[Gary Chen]

Asterisk 1.2.17
Right now I am using AGENTBYCALLERID_<agent number> variable to track agent login/logoff status. When an agent log into queue using AgentCallbackLogin(),  AGENTBYCALLERID_<agent number> is set to agent phone number. When agent logoff, I use SetGlobalVar() to empty AGENTBYCALLERID_<agent number>. This way by checking this variable, I can tell wether an agent is login or logoff in my dialplan. But sometime  AGENTBYCALLERID_<agent number> is set to empty even if the agent is still in login mode. My guess is that somewhere asterisk reset this variable. Here are my questions:
1) Can I use this variable (AGENTBYCALLERID_<agent number>) to track the status of agent for login and logff purpose?
2) What other event in Asterisk can also change value of this variable beside AgentCallbackLogin() function?
3) Any better way to do this?
4) Somebody metioned another function called AGENT. But I can not find it in my Asterisk. Does this function really exist?

I know I can use AMI to check status of agent but I only need the agent status inside my dialplan.

Gary
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