2 32. Choose the “Option” and click the “Advanced Controls”.3. Disable the “AGC” function. (no mark)MusterVoIP USB Telephone00039750Hama GmbH & Co KGPostfach 8086651 Monheim/GermanyTel. +49 (0)9091/502-0Fax +49 (0)9091/502-274hama@hama.dewww.hama.com00039750-05.060