From BlackBerry Knowledge Base - What is the Wireless Media Server
Is Wireless Media Server based on DLNA?
No- Wireless Media Server is based on uPNP technology and BlackBerry 7.1 devices are not DLNA certified. Both uPNP and DLNA are standards based technologies. To be DLNA certified, a device must support both uPNP and DLNA. Our Wireless Media Server is based on uPNP only, so we can't claim that we will work with all DLNA devices. But, many DLNA devices will work with uPNP only. DLNA capabilities were out of scope for BlackBerry 7.1 OS. Our BB10 smartphones are planned to be DLNA certified.