Raijin

Hi, I´ve been trying to connect my phone and sat nav to my srl2 intercom system and while they both connect easily enough the phone won´t connect the call part to the intercom system if the sat nav is already connected only the media part. The same goes for the sat nav, it won´t connect at all with the intercom if the phone is already connected. Has anyone else had this problem. I enjoy listening to music and long rides but still need to be reachable by phone as well as needig to head the instructions from my satnav, does anyone know how to fix this and connect them all together properly?