iPhone plays call ringtone over connected bluetooth speakers while on silent more
How To Stop Ringing Through the Bluetooth Speaker when the Music is On 


  After connecting your phone to the Bluetooth device, go to your phone’s Settings then Bluetooth Settings. Under the section Bluetooth Paired Devices you will see two settings for the paired devices: phone audio and media audio. Uncheck the phone audio option. This will stop your phone from ringing while connected to the Bluetooth device (speaker) but the music will stop when a call rings.