Dtmf Dialing - Polycom HDX series Reference Manual

Polycom hdx systems version 1.0

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DTMF Dialing

The HDX 9000 series systems generate the following tip/ring signal levels:

Low-frequency tone: 10.2 dBV, -8.0 dBm when AC termination of the line

High-frequency tone: -8.2 dBV, -6.0 dBm when AC termination of the line

The system seizes the line and waits 1.5 seconds. The number is then

dialed with a 80 ms tone period followed by a 80 ms silence period for each

Specifications