The Sonos Mobile App allows you to control your wireless speaker… wirelessly. However on corporate networks, the LAN and WLAN will be segregated  as a security measure (as it should be). Thanks to a difference in detection methods if you use a SonicWall, the Sonos mobile app will not work although the Windows application on a wireless laptop will.

This is due to the fact that SonicWall block Multicast traffic (by default), and then it has to be activated on each interface sending or receiving multicast packets. Finally, you need to allow the Wireless Zone to access the Multicast Zone on IP (Firewall > Access Rules)

Enabling Multicast Support (SonicOS)