Uniden BTSC1500 English Owners Manual - Page 10

Special Features Caller ID Announce When a call comes in, the travel kit sounds a ring tone and displays Caller ID information. In addition, the travel kit uses text-to-speech to announce the caller's phone number. To turn text-to-speech off (and back on), press Volume Up & Volume Down at the same time. Call Waiting When another call comes in while you're on the phone, the travel kit sounds a tone and displays Caller ID information for the waiting call.  To put your current call on hold and switch to the waiting call, press and hold Volume Up until you hear 2 long beeps (about 4 seconds). When you release the button, you'll be connected to the waiting call. When you want to switch back to the current call, press and hold Volume Up again to switch back to the current call.  To hang up your current call and switch to the waiting call, press and hold Volume Down until you hear 2 long beeps (about 4 seconds). When you release the button, you'll be connected to the waiting call. To use this feature, you must subscribe to Call Waiting through your service provider, and your phone must support the hands-free profile. 10