I think he is referring to the Labour contract. Yes, it is mandatory to process the RP, and it will take just one or two days. And ask your husband to check the status of the RP Application through the ministry website www.moi.com.qa. Once the RP is completed the very next day your husband can apply for visit visa and you can join him as planned. Later you can apply for family residence visa. That is the best way. Good luck and welcome to Qatar