Hi, krg62.
Thank you for visiting Apple Support Communities.
I would need a little more information on this issue to provide a better answer. Are you attempting to use a Bluetooth device with Siri? If this is the case, here are some troubleshooting steps that I would recommend going through.
Siri will work with many audio accessories, including wired and wireless headsets and car stereos.
Find information about
troubleshooting Bluetooth headsets and headphones.
Find information about
troubleshooting car stereo connections.
If you are using an audio device that connects using the Dock Connector, Siri will not route through that device. You will need to continue to use your device, wired headset, or Bluetooth headset to interact with Siri.
If you are using your iOS device with a device that uses a Remote User Interface, ensure that you control your iOS device using the car stereo or other device. Attempting to control your iOS device directly through either touchscreen, Siri, or Voice Control won't work.
iOS: Troubleshooting Siri
http://support.apple.com/kb/ts4079
Cheers,
Jason H.