Phone tapping problem with chanspy

hello, sorry for my level of English, I am French speaking. In fact I have a functional Asterisk server with several extensions: 5003, 5004 and 5005. I wanted to implement the listening of calls between extension 5003 and 5004 by extension 5005 using the ChanSpy functionality of Asterisk. I would like that when extension 5003 calls extension 5004 or vice versa, extension 5005 rings and when 5005 picks up, it hears everything that 5004 and 5003 say to each other. I also specify that 5005 continues to ring when 5003 or 5004 picks up and stops ringing when 5003 or 5004 hangs up.