Troubleshooting; Dtmf - Siemens C470IP Manual

Troubleshooting

DTMF

• DTMF problem, this stands for "Dual Tone Multi-Frequency" which is used for telephone signalling over the line in the voice-frequency
band to the call switching center. The version of DTMF used for telephone tone dialing is known by the term Touch-Tone.
• Please execute the following step when the device isn't responsive when you push a button or when your having difficulty forming the
desired telephone number.
www.DataSheet4U.com
• Go to the category TELEPHONY and click on the subcategory ADVANCED SETTINGS.
• Check the box with the text "RFC 2833" on at the top of the page and check the box with the text "AUDIO" off and click on SET.
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