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TelStop publishes a TEL handler and will be invoked on every phone call the originates from a TEL URL. TelStop will only show itself if it sees a problem with the URL. You will only see the WARNING screen if the URL looks fishy.
After installing try the TelStop Test Page 
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Now supports HTC devices in transparent mode.
Other devices (Moto, Samsung, ...) will follow.
Please report problems.
Fully transparent mode, will only bug you if it detects a malicious TEL URL.