Grandstream PBX UMC6302 with a bank of 10 GXP2170 Phones and 5 Yealink Handheld Phones

I am looking for someone to help troubleshoot and configure a Grandstream PBX UMC6302 with a bank of 10 GXP2170 phones and 5 Yealink Handheld phones. This system will be used for both internal and external communication within the company, and I am in need of advanced functionalities like overhead paging. We were previously using a Valcom V-2006AHF to page. Since getting the Grandstream system and phones I cannot get paging. It is not entirely certain at this time if additional equipment needs to be installed. I am looking for an experienced professional to configure this system for us. I would need detailed instructions of any setup procedures required and also advice on what type of maintenance would be recommended.