Good Morning

I wonder if anyone can help. We have quite an old phone system (Samsung DS-5014S) We have 6 lines coming into the building (all use the same number). What I want to know is does this phone have a feature which allows someone to answer an incoming call and then one of my colleagues in another office can listen in to the same call. I have read the user guide but I couldn't find this feature. If anyone can help, I would be appreciative