call url

Hi,
What are the variables that I can use for the following data that I need to put in a call url?
start call
end call
agent extension
agent name
VERSION: 2.14-617a
BUILD: 170529-2320
What are the variables that I can use for the following data that I need to put in a call url?
start call
end call
agent extension
agent name
VERSION: 2.14-617a
BUILD: 170529-2320