please someone help how to setup line button agent login in cisco phone like call center
Take a look at the AddQueueMember application in the Wiki.
https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Application_AddQueueMember
Along with RemoveQueueMember
https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Application_RemoveQueueMember
and possibly PauseQueueMember if your agents need to pause.
https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Application_PauseQueueMember