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Sennheiser Communications
 SupportHome » Support » FAQs » Wireless Accessories » FAQs HSL 
FAQ - HSL 10
How do I "teach" HSL 10 to recognize the phone's ringing tone?
  1. Press and hold the “P1” button until the LED flashes blue.
  2. Let your phone ring. If the recording was successful, the LED flashes red twice.
  3. If your office phone has 2 ringing tones, you can “teach” the HSL 10 the same way as described for ringing tone 1, but press the “P2” button.