Support Knowledge Base

Search Knowledge Base

MDA-200 with APC-41 Troubleshooting: Audio jumps back to PC mode while on a desk phone call


Within 60 seconds of being on a desk phone call, the MDA-200 will jump to PC mode. I’m using a Plantronics APC-41 EHS cable with my Cisco phone. Why does this happen?


Any time there is an APC-41 EHS cable plugged into the back of the MDA200 it will need a solid connection path to the AUX port of the Cisco 79xx series phone. If this connection is disrupted or not present, the "handshaking" between the MDA200 and the Cisco phone/EHS cable will not occur, which causes the MDA200 to switch back to its default state (i.e., PC mode).

Sign up to receive news and exclusive offers from Plantronics



Plantronics welcomes suggestions and feedback that can help us improve the products and services we provide.